Comment valider une URL avec une expression régulière en Python?

Question

Je construis une application sur Google App Engine. Je suis incroyablement nouveau en Python et me frappe la tête contre le problème suivant depuis 3 jours.

J'ai une classe pour représenter un flux RSS et dans cette classe j'ai une méthode appelée setUrl. L'entrée à cette méthode est une URL. 

J'essaie d'utiliser le module re python pour valider la RFC 3986 Reg-ex ( http://www.ietf.org/rfc/rfc3986.txt )

Vous trouverez ci-dessous un extrait qui devrait fonctionner? 

p = re.compile('^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?')
m = p.match(url)
if m:
  self.url = url
  return url

Answer 1

Un moyen simple d'analyser (et de valider) les URL est le module urlparse ( py2 , py3 ). 

Une regex est trop de travail.

---

Il n'y a pas de méthode "validate" car presque tout est une URL valide. Il existe certaines règles de ponctuation pour le scinder. En l'absence de ponctuation, vous avez toujours une URL valide.

Vérifiez attentivement le RFC et voyez si vous pouvez créer une URL "non valide". Les règles sont très souples. 

Par exemple, ::::: est une URL valide. Le chemin est ":::::". Un nom de fichier assez stupide, mais un nom de fichier valide.

De plus, ///// est une URL valide. Le netloc ("hostname") est "". Le chemin est "///". Encore une fois, stupide. Aussi valide. Cette URL se normalise à "///" qui est l'équivalent.

Quelque chose comme "bad://///worse/////" est parfaitement valide. Muet mais valide.

Résultat final. Analysez-le et regardez les pièces pour voir si elles déplaisent d'une manière ou d'une autre. 

Voulez-vous que le schéma soit toujours "http"? Voulez-vous que le netloc soit toujours "www.somename.somedomain"? Voulez-vous que le chemin d'accès ressemble à unix? Ou comme des fenêtres? Voulez-vous supprimer la chaîne de requête? Ou le conserver?

Ce ne sont pas des validations spécifiées par RFC. Ce sont des validations uniques à votre application.

Answer 2

Voici l'expression rationnelle complète pour analyser une URL.

(?:http://(?:(?:(?:(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?)\.
)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:\.(?:\d+)
){3}))(?::(?:\d+))?)(?:/(?:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F
\d]{2}))|[;:@&=])*)(?:/(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{
2}))|[;:@&=])*))*)(?:\?(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{
2}))|[;:@&=])*))?)?)|(?:ftp://(?:(?:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?
:%[a-fA-F\d]{2}))|[;?&=])*)(?::(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-
fA-F\d]{2}))|[;?&=])*))?@)?(?:(?:(?:(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-
)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?
:\d+)(?:\.(?:\d+)){3}))(?::(?:\d+))?))(?:/(?:(?:(?:(?:[a-zA-Z\d$\-_.+!
*'(),]|(?:%[a-fA-F\d]{2}))|[?:@&=])*)(?:/(?:(?:(?:[a-zA-Z\d$\-_.+!*'()
,]|(?:%[a-fA-F\d]{2}))|[?:@&=])*))*)(?:;type=[AIDaid])?)?)|(?:news:(?:
(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[;/?:&=])+@(?:(?:(
?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:(?:[
a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:\.(?:\d+)){3})))|(?:[a-zA-Z](
?:[a-zA-Z\d]|[_.+-])*)|\*))|(?:nntp://(?:(?:(?:(?:(?:[a-zA-Z\d](?:(?:[
a-zA-Z\d]|-)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d
])?))|(?:(?:\d+)(?:\.(?:\d+)){3}))(?::(?:\d+))?)/(?:[a-zA-Z](?:[a-zA-Z
\d]|[_.+-])*)(?:/(?:\d+))?)|(?:telnet://(?:(?:(?:(?:(?:[a-zA-Z\d$\-_.+
!*'(),]|(?:%[a-fA-F\d]{2}))|[;?&=])*)(?::(?:(?:(?:[a-zA-Z\d$\-_.+!*'()
,]|(?:%[a-fA-F\d]{2}))|[;?&=])*))?@)?(?:(?:(?:(?:(?:[a-zA-Z\d](?:(?:[a
-zA-Z\d]|-)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d]
)?))|(?:(?:\d+)(?:\.(?:\d+)){3}))(?::(?:\d+))?))/?)|(?:Gopher://(?:(?:
(?:(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:
(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:\.(?:\d+)){3}))(?::(?:\d+
))?)(?:/(?:[a-zA-Z\d$\-_.+!*'(),;/?:@&=]|(?:%[a-fA-F\d]{2}))(?:(?:(?:[
a-zA-Z\d$\-_.+!*'(),;/?:@&=]|(?:%[a-fA-F\d]{2}))*)(?:%09(?:(?:(?:[a-zA
-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[;:@&=])*)(?:%09(?:(?:[a-zA-Z\d$
\-_.+!*'(),;/?:@&=]|(?:%[a-fA-F\d]{2}))*))?)?)?)?)|(?:wais://(?:(?:(?:
(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:(?:
[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:\.(?:\d+)){3}))(?::(?:\d+))?
)/(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))*)(?:(?:/(?:(?:[a-zA
-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))*)/(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(
?:%[a-fA-F\d]{2}))*))|\?(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]
{2}))|[;:@&=])*))?)|(?:mailto:(?:(?:[a-zA-Z\d$\-_.+!*'(),;/?:@&=]|(?:%
[a-fA-F\d]{2}))+))|(?:file://(?:(?:(?:(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]
|-)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:
(?:\d+)(?:\.(?:\d+)){3}))|localhost)?/(?:(?:(?:(?:[a-zA-Z\d$\-_.+!*'()
,]|(?:%[a-fA-F\d]{2}))|[?:@&=])*)(?:/(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(
?:%[a-fA-F\d]{2}))|[?:@&=])*))*))|(?:prospero://(?:(?:(?:(?:(?:[a-zA-Z
\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)
*[a-zA-Z\d])?))|(?:(?:\d+)(?:\.(?:\d+)){3}))(?::(?:\d+))?)/(?:(?:(?:(?
:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[?:@&=])*)(?:/(?:(?:(?:[a-
zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[?:@&=])*))*)(?:(?:;(?:(?:(?:[
a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[?:@&])*)=(?:(?:(?:[a-zA-Z\d
$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[?:@&])*)))*)|(?:ldap://(?:(?:(?:(?:
(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:(?:
[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:\.(?:\d+)){3}))(?::(?:\d+))?
))?/(?:(?:(?:(?:(?:(?:(?:[a-zA-Z\d]|%(?:3\d|[46][a-fA-F\d]|[57][Aa\d])
)|(?:%20))+|(?:OID|oid)\.(?:(?:\d+)(?:\.(?:\d+))*))(?:(?:%0[Aa])?(?:%2
0)*)=(?:(?:%0[Aa])?(?:%20)*))?(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F
\d]{2}))*))(?:(?:(?:%0[Aa])?(?:%20)*)\+(?:(?:%0[Aa])?(?:%20)*)(?:(?:(?
:(?:(?:[a-zA-Z\d]|%(?:3\d|[46][a-fA-F\d]|[57][Aa\d]))|(?:%20))+|(?:OID
|oid)\.(?:(?:\d+)(?:\.(?:\d+))*))(?:(?:%0[Aa])?(?:%20)*)=(?:(?:%0[Aa])
?(?:%20)*))?(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))*)))*)(?:(
?:(?:(?:%0[Aa])?(?:%20)*)(?:[;,])(?:(?:%0[Aa])?(?:%20)*))(?:(?:(?:(?:(
?:(?:[a-zA-Z\d]|%(?:3\d|[46][a-fA-F\d]|[57][Aa\d]))|(?:%20))+|(?:OID|o
id)\.(?:(?:\d+)(?:\.(?:\d+))*))(?:(?:%0[Aa])?(?:%20)*)=(?:(?:%0[Aa])?(
?:%20)*))?(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))*))(?:(?:(?:
%0[Aa])?(?:%20)*)\+(?:(?:%0[Aa])?(?:%20)*)(?:(?:(?:(?:(?:[a-zA-Z\d]|%(
?:3\d|[46][a-fA-F\d]|[57][Aa\d]))|(?:%20))+|(?:OID|oid)\.(?:(?:\d+)(?:
\.(?:\d+))*))(?:(?:%0[Aa])?(?:%20)*)=(?:(?:%0[Aa])?(?:%20)*))?(?:(?:[a
-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))*)))*))*(?:(?:(?:%0[Aa])?(?:%2
0)*)(?:[;,])(?:(?:%0[Aa])?(?:%20)*))?)(?:\?(?:(?:(?:(?:[a-zA-Z\d$\-_.+
!*'(),]|(?:%[a-fA-F\d]{2}))+)(?:,(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-f
A-F\d]{2}))+))*)?)(?:\?(?:base|one|sub)(?:\?(?:((?:[a-zA-Z\d$\-_.+!*'(
),;/?:@&=]|(?:%[a-fA-F\d]{2}))+)))?)?)?)|(?:(?:z39\.50[rs])://(?:(?:(?
:(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?)\.)*(?:[a-zA-Z](?:(?
:[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:\.(?:\d+)){3}))(?::(?:\d+))
?)(?:/(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))+)(?:\+(?:(?:
[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))+))*(?:\?(?:(?:[a-zA-Z\d$\-_
.+!*'(),]|(?:%[a-fA-F\d]{2}))+))?)?(?:;esn=(?:(?:[a-zA-Z\d$\-_.+!*'(),
]|(?:%[a-fA-F\d]{2}))+))?(?:;rs=(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA
-F\d]{2}))+)(?:\+(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))+))*)
?))|(?:cid:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[;?:@&=
])*))|(?:mid:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[;?:@
&=])*)(?:/(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[;?:@&=]
)*))?)|(?:vemmi://(?:(?:(?:(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z
\d])?)\.)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:\
.(?:\d+)){3}))(?::(?:\d+))?)(?:/(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a
-fA-F\d]{2}))|[/?:@&=])*)(?:(?:;(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a
-fA-F\d]{2}))|[/?:@&])*)=(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d
]{2}))|[/?:@&])*))*))?)|(?:imap://(?:(?:(?:(?:(?:(?:(?:[a-zA-Z\d$\-_.+
!*'(),]|(?:%[a-fA-F\d]{2}))|[&=~])+)(?:(?:;[Aa][Uu][Tt][Hh]=(?:\*|(?:(
?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[&=~])+))))?)|(?:(?:;[
Aa][Uu][Tt][Hh]=(?:\*|(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2
}))|[&=~])+)))(?:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[
&=~])+))?))@)?(?:(?:(?:(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])
?)\.)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:\.(?:
\d+)){3}))(?::(?:\d+))?))/(?:(?:(?:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:
%[a-fA-F\d]{2}))|[&=~:@/])+)?;[Tt][Yy][Pp][Ee]=(?:[Ll](?:[Ii][Ss][Tt]|
[Ss][Uu][Bb])))|(?:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))
|[&=~:@/])+)(?:\?(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[
&=~:@/])+))?(?:(?:;[Uu][Ii][Dd][Vv][Aa][Ll][Ii][Dd][Ii][Tt][Yy]=(?:[1-
9]\d*)))?)|(?:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[&=~
:@/])+)(?:(?:;[Uu][Ii][Dd][Vv][Aa][Ll][Ii][Dd][Ii][Tt][Yy]=(?:[1-9]\d*
)))?(?:/;[Uu][Ii][Dd]=(?:[1-9]\d*))(?:(?:/;[Ss][Ee][Cc][Tt][Ii][Oo][Nn
]=(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[&=~:@/])+)))?))
)?)|(?:nfs:(?:(?://(?:(?:(?:(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-
Z\d])?)\.)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:
\.(?:\d+)){3}))(?::(?:\d+))?)(?:(?:/(?:(?:(?:(?:(?:[a-zA-Z\d\$\-_.!~*'
(),])|(?:%[a-fA-F\d]{2})|[:@&=+])*)(?:/(?:(?:(?:[a-zA-Z\d\$\-_.!~*'(),
])|(?:%[a-fA-F\d]{2})|[:@&=+])*))*)?)))?)|(?:/(?:(?:(?:(?:(?:[a-zA-Z\d
\$\-_.!~*'(),])|(?:%[a-fA-F\d]{2})|[:@&=+])*)(?:/(?:(?:(?:[a-zA-Z\d\$\
-_.!~*'(),])|(?:%[a-fA-F\d]{2})|[:@&=+])*))*)?))|(?:(?:(?:(?:(?:[a-zA-
Z\d\$\-_.!~*'(),])|(?:%[a-fA-F\d]{2})|[:@&=+])*)(?:/(?:(?:(?:[a-zA-Z\d
\$\-_.!~*'(),])|(?:%[a-fA-F\d]{2})|[:@&=+])*))*)?)))

Compte tenu de sa complexité, je pense que vous devriez opter pour l'urlparse.

Pour être complet, voici le pseudo-BNF de la regex ci-dessus (en tant que documentation):

; La forme générique d'une URL est la suivante: 

 Genericurl = scheme ":" schemepart 

; Des schémas prédéfinis spécifiques sont définis ici; nouveaux régimes 
; peut être enregistré avec IANA 

 url = httpurl | ftpurl | newsurl | 
 nntpurl | telneturl | gopherurl | 
 waisurl | mailtourl | fileurl | 
 prosperourl | otherurl 

; les nouveaux schémas suivent la syntaxe générale 
 otherurl = genericurl 

; le schéma est en minuscule; les interprètes doivent utiliser case-ignore 
 scheme = 1 * [lowalpha | chiffre | "+" | "-" | "." ] 
 schemepart = * xchar | ip-schemepart 


; URL schemeparts pour les protocoles basés sur ip: 

 Ip-schemepart = "//" login ["/" urlpath] 

 Login = [utilisateur [":" mot de passe] "@"] hostport
 hostport = Host [":" port] 
 Host = nom_hôte | numéro_hôte 
 nom_hôte = * [étiquette_domaine "." ] toplabel 
 domainlabel = alphadigit | alphadigit * [alphadigit | "-"] alphadigit 
 toplabel = alpha | alpha * [alphadigit | "-"] alphadigit 
 alphadigit = alpha | digit 
 hostnumber = digits "." chiffres "." chiffres "." digits 
 port = digits 
 user = * [uchar | ";" | "?" | "&" | "="] 
 password = * [uchar | ";" | "?" | "&" | "="] 
 urlpath = * xchar; dépend du protocole, voir section 3.1 

; Les schémas prédéfinis: 

; FTP (voir aussi RFC959) 

 Ftpurl = "ftp: //" login ["/" fpath ["; type =" ftptype]] 
 Fpath = fsegment * ["/" fsegment] 
fsegment = * [uchar | "?" | ":" | "@" | "&" | "="] 
 ftptype = "A" | "Je" | "D" | "a" | "i" | "ré"

; FILE 

 Fileurl = "fichier: //" [hôte | "localhost"] "/" fpath 

; HTTP 

 Httpurl = "http: //" hostport ["/" hpath ["?" recherche]] 
 hpath = hsegment * ["/" hsegment] 
 hsegment = * [uchar | ";" | ":" | "@" | "&" | "="] 
 search = * [uchar | ";" | ":" | "@" | "&" | "="] 

; Gopher (voir également RFC1436) 

 Gopherurl = "Gopher: //" hostport [/ [gtype [selector 
 ["% 09" recherche ["% 09" Gopher + _string]]]] 
 Gtype = xchar 
 Sélecteur = * xchar 
 Gopher + _string = * xchar 

; MAILTO (voir aussi RFC822) 

 Mailtourl = "mailto:" encoded822addr 
 Encoded822addr = 1 * xchar; davantage défini dans la RFC822 

; NEWS (voir aussi RFC1036) 

 Newsurl = "news:" grouppart 
 Grouppart = "*" | groupe | article
group = alpha * [alpha | chiffre | "-" | "." | "+" | "_"] 
 article = 1 * [uchar | ";" | "/" | "?" | ":" | "&" | "="] "@" Host 

; NNTP (voir aussi RFC977) 

 Nntpurl = "nntp: //" hostport "/" groupe ["/" chiffres] 
.__; TELNET 

 Telneturl = "telnet: //" login ["/"] 

; WAIS (voir aussi RFC1625) 

 Waisurl = waisdatabase | waisindex | waisdoc 
 waisdatabase = "wais: //" hostport "/" base de données 
 waisindex = "wais: //" hostport "/" base de données "?" search 
 waisdoc = "wais: //" hostport "/" database "/" wtype "/" wpath 
 database = * uchar 
 wtype = * uchar 
 wpath = * uchar 

; PROSPERO 

 Prosperourl = "prospero: //" hostport "/" ppath * [fieldspec] 
 Ppath = psegment * ["/" psegment] 
 Psegment = * [uchar | "?" | ":" | "@" | "&" | "="] 
 fieldspec = ";" fieldname "=" fieldvalue 
 fieldname = * [uchar | "?" | ":" | "@" | "&"] 
 fieldvalue = * [uchar | "?" | ":" | "@" | "&"] 

; Définitions diverses 

 Lowalpha = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | 
 "i" | "j" | "k" | "l" | "m" | "n" | "o" | "p" | 
 "q" | "r" | "s" | "t" | "u" | "v" | "w" | "x" | 
 "y" | "z" 
 hialpha = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "Je" | 
 "J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" | 
 "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z" 
 Alpha = lowalpha | hialpha 
 digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | 
 "8" | "9" 
 Safe = "$" | "-" | "_" | "." | "+" 
 extra = "!" | "*" | "'" | "(" | ")" | "," 
 national = "{" | "}" | "|" | "\" | "^" | "~" | "[" | "]" | "` "
 punctuation =" "| "#" | "%" | 


 reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" 
 hex = digit | "A" | "B" | "C" | "D" | "E" | "F" | 
 "a" | "b" | "c" | "d" | "e" | "f" 
 escape = "%" hex hex 

 sans réserve = alpha | chiffre | coffre-fort | extra 
 uchar = non réservé | échapper 
 xchar = non réservé | réservé | échappement 
 chiffres = 1 * chiffre 

Answer 3

Je reconnais que je trouve votre expression habituelle totalement incompréhensible. Je me demande si vous pourriez utiliser urlparse à la place? Quelque chose comme:

pieces = urlparse.urlparse(url)
assert all([pieces.scheme, pieces.netloc])
assert set(pieces.netloc) <= set(string.letters + string.digits + '-.')  # and others?
assert pieces.scheme in ['http', 'https', 'ftp']  # etc.

Cela peut être plus lent et peut-être que vous manquerez des conditions, mais il me semble qu'il est beaucoup plus facile à lire et à déboguer que une expression régulière pour les URL .

Answer 4

J'utilise celui utilisé par Django et cela semble plutôt bien fonctionner:

def is_valid_url(url):
    import re
    regex = re.compile(
        r'^https?://'  # http:// or https://
        r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+[A-Z]{2,6}\.?|'  # domain...
        r'localhost|'  # localhost...
        r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})' # ...or ip
        r'(?::\d+)?'  # optional port
        r'(?:/?|[/?]\S+)$', re.IGNORECASE)
    return url is not None and regex.search(url)

Vous pouvez toujours consulter la dernière version ici: https://github.com/Django/django/blob/master/Django/core/validators.py#L74

Answer 5

http://pypi.python.org/pypi/rfc3987 donne des expressions régulières pour assurer la cohérence avec les règles de RFC 3986 et RFC 3987 (c'est-à-dire, pas avec les règles spécifiques au schéma).

Une expression rationnelle pour IRI_reference est:

(?P<scheme>[a-zA-Z][a-zA-Z0-9+.-]*):(?://(?P<iauthority>(?:(?P<iuserinfo>(?:(?:[
a-zA-Z0-9._~-]|[\xa0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-\U0001fffd\U0002
0000-\U0002fffd\U00030000-\U0003fffd\U00040000-\U0004fffd\U00050000-\U0005fffd\U
00060000-\U0006fffd\U00070000-\U0007fffd\U00080000-\U0008fffd\U00090000-\U0009ff
fd\U000a0000-\U000afffd\U000b0000-\U000bfffd\U000c0000-\U000cfffd\U000d0000-\U00
0dfffd\U000e1000-\U000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=]|:)*)@)?(?P<ihost>\
\[(?:(?:[0-9A-F]{1,4}:){6}(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4]
[0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|::(?:[0
-9A-F]{1,4}:){5}(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]
?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|[0-9A-F]{1,4}?::(
?:[0-9A-F]{1,4}:){4}(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4][0-9]|
[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|(?:(?:[0-9A-F
]{1,4}:)?[0-9A-F]{1,4})?::(?:[0-9A-F]{1,4}:){3}(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?
:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[
0-9][0-9]?)))|(?:(?:[0-9A-F]{1,4}:){,2}[0-9A-F]{1,4})?::(?:[0-9A-F]{1,4}:){2}(?:
[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3
}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|(?:(?:[0-9A-F]{1,4}:){,3}[0-9A-F]{1,
4})?::(?:[0-9A-F]{1,4}:)(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4][0
-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|(?:(?:[0-
9A-F]{1,4}:){,4}[0-9A-F]{1,4})?::(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]
|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|
(?:(?:[0-9A-F]{1,4}:){,5}[0-9A-F]{1,4})?::[0-9A-F]{1,4}|(?:(?:[0-9A-F]{1,4}:){,6
}[0-9A-F]{1,4})?::|v[0-9A-F]+\\.(?:[a-zA-Z0-9_.~-]|[!$&'()*+,;=]|:)+)\\]|(?:(?:(
?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][
0-9]?))|(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-\
U0001fffd\U00020000-\U0002fffd\U00030000-\U0003fffd\U00040000-\U0004fffd\U000500
00-\U0005fffd\U00060000-\U0006fffd\U00070000-\U0007fffd\U00080000-\U0008fffd\U00
090000-\U0009fffd\U000a0000-\U000afffd\U000b0000-\U000bfffd\U000c0000-\U000cfffd
\U000d0000-\U000dfffd\U000e1000-\U000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=])*)(
?::(?P<port>[0-9]*))?)(?P<ipath>(?:/(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7ff\uf900-\uf
dcf\ufdf0-\uffef\U00010000-\U0001fffd\U00020000-\U0002fffd\U00030000-\U0003fffd\
U00040000-\U0004fffd\U00050000-\U0005fffd\U00060000-\U0006fffd\U00070000-\U0007f
ffd\U00080000-\U0008fffd\U00090000-\U0009fffd\U000a0000-\U000afffd\U000b0000-\U0
00bfffd\U000c0000-\U000cfffd\U000d0000-\U000dfffd\U000e1000-\U000efffd])|%[0-9A-
F][0-9A-F]|[!$&'()*+,;=]|:|@)*)*)|(?P<ipath>/(?:(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7
ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-\U0001fffd\U00020000-\U0002fffd\U00030000
-\U0003fffd\U00040000-\U0004fffd\U00050000-\U0005fffd\U00060000-\U0006fffd\U0007
0000-\U0007fffd\U00080000-\U0008fffd\U00090000-\U0009fffd\U000a0000-\U000afffd\U
000b0000-\U000bfffd\U000c0000-\U000cfffd\U000d0000-\U000dfffd\U000e1000-\U000eff
fd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=]|:|@)+(?:/(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7ff
\uf900-\ufdcf\ufdf0-\uffef\U00010000-\U0001fffd\U00020000-\U0002fffd\U00030000-\
U0003fffd\U00040000-\U0004fffd\U00050000-\U0005fffd\U00060000-\U0006fffd\U000700
00-\U0007fffd\U00080000-\U0008fffd\U00090000-\U0009fffd\U000a0000-\U000afffd\U00
0b0000-\U000bfffd\U000c0000-\U000cfffd\U000d0000-\U000dfffd\U000e1000-\U000efffd
])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=]|:|@)*)*)?)|(?P<ipath>(?:(?:[a-zA-Z0-9._~-]|[\
xa0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-\U0001fffd\U00020000-\U0002fffd\U
00030000-\U0003fffd\U00040000-\U0004fffd\U00050000-\U0005fffd\U00060000-\U0006ff
fd\U00070000-\U0007fffd\U00080000-\U0008fffd\U00090000-\U0009fffd\U000a0000-\U00
0afffd\U000b0000-\U000bfffd\U000c0000-\U000cfffd\U000d0000-\U000dfffd\U000e1000-
\U000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=]|:|@)+(?:/(?:(?:[a-zA-Z0-9._~-]|[\xa
0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-\U0001fffd\U00020000-\U0002fffd\U00
030000-\U0003fffd\U00040000-\U0004fffd\U00050000-\U0005fffd\U00060000-\U0006fffd
\U00070000-\U0007fffd\U00080000-\U0008fffd\U00090000-\U0009fffd\U000a0000-\U000a
fffd\U000b0000-\U000bfffd\U000c0000-\U000cfffd\U000d0000-\U000dfffd\U000e1000-\U
000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=]|:|@)*)*)|(?P<ipath>))(?:\\?(?P<iquery
>(?:(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-\U000
1fffd\U00020000-\U0002fffd\U00030000-\U0003fffd\U00040000-\U0004fffd\U00050000-\
U0005fffd\U00060000-\U0006fffd\U00070000-\U0007fffd\U00080000-\U0008fffd\U000900
00-\U0009fffd\U000a0000-\U000afffd\U000b0000-\U000bfffd\U000c0000-\U000cfffd\U00
0d0000-\U000dfffd\U000e1000-\U000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=]|:|@)|[\
ue000-\uf8ff\U000f0000-\U000ffffd\U00100000-\U0010fffd]|/|\\?)*))?(?:\\#(?P<ifra
gment>(?:(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-
\U0001fffd\U00020000-\U0002fffd\U00030000-\U0003fffd\U00040000-\U0004fffd\U00050
000-\U0005fffd\U00060000-\U0006fffd\U00070000-\U0007fffd\U00080000-\U0008fffd\U0
0090000-\U0009fffd\U000a0000-\U000afffd\U000b0000-\U000bfffd\U000c0000-\U000cfff
d\U000d0000-\U000dfffd\U000e1000-\U000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=]|:|
@)|/|\\?)*))?|(?:(?://(?P<iauthority>(?:(?P<iuserinfo>(?:(?:[a-zA-Z0-9._~-]|[\xa
0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-\U0001fffd\U00020000-\U0002fffd\U00
030000-\U0003fffd\U00040000-\U0004fffd\U00050000-\U0005fffd\U00060000-\U0006fffd
\U00070000-\U0007fffd\U00080000-\U0008fffd\U00090000-\U0009fffd\U000a0000-\U000a
fffd\U000b0000-\U000bfffd\U000c0000-\U000cfffd\U000d0000-\U000dfffd\U000e1000-\U
000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=]|:)*)@)?(?P<ihost>\\[(?:(?:[0-9A-F]{1,
4}:){6}(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-
9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|::(?:[0-9A-F]{1,4}:){5}(?:
[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3
}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|[0-9A-F]{1,4}?::(?:[0-9A-F]{1,4}:){4
}(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\
.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|(?:(?:[0-9A-F]{1,4}:)?[0-9A-F]{1
,4})?::(?:[0-9A-F]{1,4}:){3}(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-
4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|(?:(?
:[0-9A-F]{1,4}:){,2}[0-9A-F]{1,4})?::(?:[0-9A-F]{1,4}:){2}(?:[0-9A-F]{1,4}:[0-9A
-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][
0-9]|[01]?[0-9][0-9]?)))|(?:(?:[0-9A-F]{1,4}:){,3}[0-9A-F]{1,4})?::(?:[0-9A-F]{1
,4}:)(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]
?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|(?:(?:[0-9A-F]{1,4}:){,4}[0-
9A-F]{1,4})?::(?:[0-9A-F]{1,4}:[0-9A-F]{1,4}|(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[
0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)))|(?:(?:[0-9A-F]{1,4}
:){,5}[0-9A-F]{1,4})?::[0-9A-F]{1,4}|(?:(?:[0-9A-F]{1,4}:){,6}[0-9A-F]{1,4})?::|
v[0-9A-F]+\\.(?:[a-zA-Z0-9_.~-]|[!$&'()*+,;=]|:)+)\\]|(?:(?:(?:25[0-5]|2[0-4][0-
9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))|(?:(?:[a-zA
-Z0-9._~-]|[\xa0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-\U0001fffd\U00020000
-\U0002fffd\U00030000-\U0003fffd\U00040000-\U0004fffd\U00050000-\U0005fffd\U0006
0000-\U0006fffd\U00070000-\U0007fffd\U00080000-\U0008fffd\U00090000-\U0009fffd\U
000a0000-\U000afffd\U000b0000-\U000bfffd\U000c0000-\U000cfffd\U000d0000-\U000dff
fd\U000e1000-\U000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=])*)(?::(?P<port>[0-9]*)
)?)(?P<ipath>(?:/(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U0
0010000-\U0001fffd\U00020000-\U0002fffd\U00030000-\U0003fffd\U00040000-\U0004fff
d\U00050000-\U0005fffd\U00060000-\U0006fffd\U00070000-\U0007fffd\U00080000-\U000
8fffd\U00090000-\U0009fffd\U000a0000-\U000afffd\U000b0000-\U000bfffd\U000c0000-\
U000cfffd\U000d0000-\U000dfffd\U000e1000-\U000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*
+,;=]|:|@)*)*)|(?P<ipath>/(?:(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7ff\uf900-\ufdcf\ufd
f0-\uffef\U00010000-\U0001fffd\U00020000-\U0002fffd\U00030000-\U0003fffd\U000400
00-\U0004fffd\U00050000-\U0005fffd\U00060000-\U0006fffd\U00070000-\U0007fffd\U00
080000-\U0008fffd\U00090000-\U0009fffd\U000a0000-\U000afffd\U000b0000-\U000bfffd
\U000c0000-\U000cfffd\U000d0000-\U000dfffd\U000e1000-\U000efffd])|%[0-9A-F][0-9A
-F]|[!$&'()*+,;=]|:|@)+(?:/(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7ff\uf900-\ufdcf\ufdf0
-\uffef\U00010000-\U0001fffd\U00020000-\U0002fffd\U00030000-\U0003fffd\U00040000
-\U0004fffd\U00050000-\U0005fffd\U00060000-\U0006fffd\U00070000-\U0007fffd\U0008
0000-\U0008fffd\U00090000-\U0009fffd\U000a0000-\U000afffd\U000b0000-\U000bfffd\U
000c0000-\U000cfffd\U000d0000-\U000dfffd\U000e1000-\U000efffd])|%[0-9A-F][0-9A-F
]|[!$&'()*+,;=]|:|@)*)*)?)|(?P<ipath>(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7ff\uf900-\u
fdcf\ufdf0-\uffef\U00010000-\U0001fffd\U00020000-\U0002fffd\U00030000-\U0003fffd
\U00040000-\U0004fffd\U00050000-\U0005fffd\U00060000-\U0006fffd\U00070000-\U0007
fffd\U00080000-\U0008fffd\U00090000-\U0009fffd\U000a0000-\U000afffd\U000b0000-\U
000bfffd\U000c0000-\U000cfffd\U000d0000-\U000dfffd\U000e1000-\U000efffd])|%[0-9A
-F][0-9A-F]|[!$&'()*+,;=]|@)+(?:/(?:(?:[a-zA-Z0-9._~-]|[\xa0-\ud7ff\uf900-\ufdcf
\ufdf0-\uffef\U00010000-\U0001fffd\U00020000-\U0002fffd\U00030000-\U0003fffd\U00
040000-\U0004fffd\U00050000-\U0005fffd\U00060000-\U0006fffd\U00070000-\U0007fffd
\U00080000-\U0008fffd\U00090000-\U0009fffd\U000a0000-\U000afffd\U000b0000-\U000b
fffd\U000c0000-\U000cfffd\U000d0000-\U000dfffd\U000e1000-\U000efffd])|%[0-9A-F][
0-9A-F]|[!$&'()*+,;=]|:|@)*)*)|(?P<ipath>))(?:\\?(?P<iquery>(?:(?:(?:[a-zA-Z0-9.
_~-]|[\xa0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-\U0001fffd\U00020000-\U000
2fffd\U00030000-\U0003fffd\U00040000-\U0004fffd\U00050000-\U0005fffd\U00060000-\
U0006fffd\U00070000-\U0007fffd\U00080000-\U0008fffd\U00090000-\U0009fffd\U000a00
00-\U000afffd\U000b0000-\U000bfffd\U000c0000-\U000cfffd\U000d0000-\U000dfffd\U00
0e1000-\U000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=]|:|@)|[\ue000-\uf8ff\U000f000
0-\U000ffffd\U00100000-\U0010fffd]|/|\\?)*))?(?:\\#(?P<ifragment>(?:(?:(?:[a-zA-
Z0-9._~-]|[\xa0-\ud7ff\uf900-\ufdcf\ufdf0-\uffef\U00010000-\U0001fffd\U00020000-
\U0002fffd\U00030000-\U0003fffd\U00040000-\U0004fffd\U00050000-\U0005fffd\U00060
000-\U0006fffd\U00070000-\U0007fffd\U00080000-\U0008fffd\U00090000-\U0009fffd\U0
00a0000-\U000afffd\U000b0000-\U000bfffd\U000c0000-\U000cfffd\U000d0000-\U000dfff
d\U000e1000-\U000efffd])|%[0-9A-F][0-9A-F]|[!$&'()*+,;=]|:|@)|/|\\?)*))?)

En une ligne:

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Answer 6

note - Lepl n'est plus maintenu ni pris en charge.

La RFC 3696 définit les "meilleures pratiques" pour la validation des URL - http://www.faqs.org/rfcs/rfc3696.html

La dernière version de Lepl (une bibliothèque d’analyseurs Python) inclut une implémentation de la RFC 3696. Vous l’utiliseriez comme suit:

from lepl.apps.rfc3696 import Email, HttpUrl

# compile the validators (do once at start of program)
valid_email = Email()
valid_http_url = HttpUrl()

# use the validators (as often as you like)
if valid_email(some_email):
    # email is ok
else:
    # email is bad
if valid_http_url(some_url):
    # url is ok
else:
    # url is bad

Bien que les validateurs soient définis dans Lepl, qui est un analyseur de descente récursif, ils sont en grande partie compilés en interne en expressions régulières. Cela combine le meilleur des deux mondes - une définition (relativement) facile à lire qui peut être vérifiée par rapport à la RFC 3696 and _ une implémentation efficace. Un article sur mon blog montre comment cela simplifie l’analyseur - http://www.acooke.org/cute/LEPLOptimi0.html

Lepl est disponible sur http://www.acooke.org/lepl et le module RFC 3696 est documenté sur http://www.acooke.org/lepl/rfc3696.html

Ceci est complètement nouveau dans cette version, donc peut contenir des bugs. S'il vous plaît contactez-moi si vous avez des problèmes et je vais les résoudre dès que possible. Merci.

Answer 7

urlparse prend très heureusement les URL invalides, c’est plus une bibliothèque de division de chaîne de caractères que tout type de validateur. Par exemple:

from urlparse import urlparse
urlparse('http://----')
# returns: ParseResult(scheme='http', netloc='----', path='', params='', query='', fragment='')

Selon la situation, cela pourrait bien se passer ..

Si vous faites principalement confiance aux données et souhaitez simplement vérifier que le protocole est HTTP, alors urlparse est parfait.

Si vous voulez que l'URL soit en fait une URL légale, utilisez la regex ridicule

Si vous voulez vous assurer que c'est une vraie adresse Web,

import urllib
try:
    urllib.urlopen(url)
except IOError:
    print "Not a real URL"

Answer 8

La regex fournie doit correspondre à toute URL du formulaire http://www.ietf.org/rfc/rfc3986.txt ; et fait quand testé dans l'interpréteur de python.

Quel est le format des URL que vous avez eu du mal à analyser?

Answer 9

Actuellement, dans 90% des cas, si vous utilisez une URL en python, vous utilisez probablement des requêtes python. Alors maintenant, la question "Pourquoi ne pas réutiliser la validation d'URL à partir de requêtes"?

from requests.models import PreparedRequest
import requests.exceptions


def check_url(url):
    prepared_request = PreparedRequest()
    try:
        prepared_request.prepare_url(url, None)
        return prepared_request.url
    except requests.exceptions.MissingSchema, e:
        raise SomeException

fonctionnalité:

• ne réinvente pas la roue
• DRY
• déconnecté de travail
• ressource minimale

Answer 10

J'ai eu besoin de faire cela plusieurs fois au fil des ans et je finis toujours par copier les expressions régulières de quelqu'un d'autre qui y a pensé bien plus que je veux n'y pense pas.

Ceci dit, il y a une expression régulière dans le code des formulaires Django qui devrait faire l'affaire:

http://code.djangoproject.com/browser/Django/trunk/Django/forms/fields.py#L534

Answer 11

fichier regex de validation des URL Django modifié:

import re

ul = '\u00a1-\uffff'  # unicode letters range (must not be a raw string)

# IP patterns 
ipv4_re = r'(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}' 
ipv6_re = r'\[[0-9a-f:\.]+\]'

# Host patterns 
hostname_re = r'[a-z' + ul + r'0-9](?:[a-z' + ul + r'0-9-]{0,61}[a-z' + ul + r'0-9])?'
domain_re = r'(?:\.(?!-)[a-z' + ul + r'0-9-]{1,63}(?<!-))*' # domain names have max length of 63 characters
tld_re = ( 
    r'\.'                                # dot 
    r'(?!-)'                             # can't start with a dash 
    r'(?:[a-z' + ul + '-]{2,63}'         # domain label 
    r'|xn--[a-z0-9]{1,59})'              # or punycode label 
    r'(?<!-)'                            # can't end with a dash 
    r'\.?'                               # may have a trailing dot 
) 
Host_re = '(' + hostname_re + domain_re + tld_re + '|localhost)'

regex = re.compile( 
    r'^(?:http|ftp)s?://' # http(s):// or ftp(s)://
    r'(?:\S+(?::\S*)?@)?'  # user:pass authentication 
    r'(?:' + ipv4_re + '|' + ipv6_re + '|' + Host_re + ')' # localhost or ip
    r'(?::\d{2,5})?'  # optional port
    r'(?:[/?#][^\s]*)?'  # resource path
    r'\Z', re.IGNORECASE)

source: https://github.com/Django/django/blob/master/Django/core/validators.py#L74

Answer 12

urlfinders = [
    re.compile("([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}|(((news|telnet|nttp|file|http|ftp|https)://)|(www|ftp)[-A-Za-z0-9]*\\.)[-A-Za-z0-9\\.]+)(:[0-9]*)?/[-A-Za-z0-9_\\$\\.\\+\\!\\*\\(\\),;:@&=\\?/~\\#\\%]*[^]'\\.}>\\),\\\"]"),
    re.compile("([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}|(((news|telnet|nttp|file|http|ftp|https)://)|(www|ftp)[-A-Za-z0-9]*\\.)[-A-Za-z0-9\\.]+)(:[0-9]*)?"),
    re.compile("(~/|/|\\./)([-A-Za-z0-9_\\$\\.\\+\\!\\*\\(\\),;:@&=\\?/~\\#\\%]|\\\\
)+"),
    re.compile("'\\<((mailto:)|)[-A-Za-z0-9\\.]+@[-A-Za-z0-9\\.]+"),
]

NOTE: Aussi moche que cela puisse paraître dans votre navigateur, il suffit de copier/coller et le formatage devrait être bon

Trouvé sur les listes de diffusion python et utilisé pour le terminal gnome

source: http://mail.python.org/pipermail/python-list/2007-January/595436.html