पाइथन में नियमित अभिव्यक्ति वाले URL को आप कैसे सत्यापित करते हैं?

Question

मैं Google ऐप इंजन पर एक ऐप बना रहा हूं। मैं पाइथन के लिए अविश्वसनीय रूप से नया हूं और पिछले 3 दिनों से निम्नलिखित समस्या के खिलाफ अपना सिर मार रहा हूं।

मेरे पास एक आरएसएस फ़ीड का प्रतिनिधित्व करने के लिए एक कक्षा है और इस कक्षा में मेरे पास setUrl नामक एक विधि है। इस विधि में इनपुट एक यूआरएल है।

मैं RFC 3986 के बंद को मान्य करने के फिर से अजगर मॉड्यूल का उपयोग करने के लिए कोशिश कर रहा हूँ रेग-पूर्व (http://www.ietf.org/rfc/rfc3986.txt)

नीचे एक कतरना जो चाहिए काम है?

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

Answer 1

यूआरएल का विश्लेषण (और मान्य) करने का एक आसान तरीका urlparse (py2, py3) मॉड्यूल है।

एक रेगेक्स बहुत अधिक काम है।

---

कोई "मान्य" विधि नहीं है क्योंकि लगभग कुछ भी एक वैध यूआरएल है। इसे विभाजित करने के लिए कुछ विराम चिह्न नियम हैं। किसी भी विराम चिह्न को अनुपस्थित करें, आपके पास अभी भी एक वैध यूआरएल है।

आरएफसी सावधानीपूर्वक जांचें और देखें कि क्या आप "अमान्य" यूआरएल बना सकते हैं। नियम बहुत लचीले हैं।

उदाहरण के लिए ::::: एक मान्य यूआरएल है। पथ ":::::" है। एक सुंदर बेवकूफ फ़ाइल नाम, लेकिन एक वैध फ़ाइल नाम।

इसके अलावा, ///// एक मान्य यूआरएल है। नेटलोक ("होस्टनाम") "" है। पथ "///" है। फिर, बेवकूफ। यह भी मान्य है। यह यूआरएल "///" को सामान्य बनाता है जो बराबर है।

"bad://///worse/////" जैसी कुछ पूरी तरह मान्य है। गूंगा लेकिन वैध।

नीचे रेखा। इसे पार्स करें, और यह देखने के लिए टुकड़ों को देखें कि वे किसी तरह से नापसंद हैं या नहीं।

क्या आप योजना हमेशा "http" होना चाहते हैं? क्या आप नेटलोक हमेशा "www.somename.somedomain" होना चाहते हैं? क्या आप यूनिक्स की तरह दिखने का मार्ग चाहते हैं? या खिड़कियों की तरह? क्या आप क्वेरी स्ट्रिंग को हटाना चाहते हैं? या इसे संरक्षित करें?

ये आरएफसी-निर्दिष्ट मान्यताओं नहीं हैं। ये आपके आवेदन के लिए अद्वितीय मान्यताओं हैं।

Answer 2

प्रदान किया गया रेगेक्स http://www.ietf.org/rfc/rfc3986.txt फ़ॉर्म के किसी भी यूआरएल से मेल खाना चाहिए; और जब पाइथन दुभाषिया में परीक्षण किया जाता है।

आपके पास पार्सिंग में समस्या वाले यूआरएल के प्रारूप में कौन से प्रारूप हैं?

Answer 3

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\\.]+"), 
] 

नोट: के रूप में यह आपके ब्राउज़र में लग रहा है के रूप में बदसूरत सिर्फ पेस्ट कॉपी और स्वरूपण अच्छा होना चाहिए

अजगर मेलिंग सूची पर मिले और GNOME टर्मिनल

स्रोत के लिए इस्तेमाल किया: http://mail.python.org/pipermail/python-list/2007-January/595436.html

Answer 4

मैं मानता हूं, मुझे आपकी नियमित अभिव्यक्ति पूरी तरह से समझ में नहीं आती है। मुझे आश्चर्य है कि क्या आप इसके बजाय urlparse का उपयोग कर सकते हैं? की तरह कुछ:

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. 

यह धीमी हो सकती है, और हो सकता है आप की स्थिति को खो देंगे, लेकिन यह (मेरे लिए) लगता है एक बहुत पढ़ने के लिए और आसान a regular expression for URLs से डिबग।

Answer 5

मुझे वर्षों में कई बार ऐसा करने की ज़रूरत है और हमेशा किसी और की नियमित अभिव्यक्ति की प्रतिलिपि बनाने की आवश्यकता है, जिसने इसके बारे में सोचा है कि से इसके बारे में सोचने के लिए इसके बारे में सोचा है।

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

Answer 6

यहाँ एक यूआरएल को पार्स करने के पूरा regexp है:

कहा करने के बाद कि, वहाँ Django में एक regex है कोड है जो चाल करना चाहिए रूपों।

(?: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})|[:@&=+])*))*)?))) 

इसकी जटिलता को देखते हुए, मुझे लगता है कि आपको urlparse रास्ता जाना चाहिए। काफी खुशी से

; The generic form of a URL is: 

genericurl  = scheme ":" schemepart 

; Specific predefined schemes are defined here; new schemes 
; may be registered with IANA 

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

; new schemes follow the general syntax 
otherurl  = genericurl 

; the scheme is in lower case; interpreters should use case-ignore 
scheme   = 1*[ lowalpha | digit | "+" | "-" | "." ] 
schemepart  = *xchar | ip-schemepart 


; URL schemeparts for ip based protocols: 

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

login   = [ user [ ":" password ] "@" ] hostport 
hostport  = host [ ":" port ] 
host   = hostname | hostnumber 
hostname  = *[ domainlabel "." ] toplabel 
domainlabel = alphadigit | alphadigit *[ alphadigit | "-" ] alphadigit 
toplabel  = alpha | alpha *[ alphadigit | "-" ] alphadigit 
alphadigit  = alpha | digit 
hostnumber  = digits "." digits "." digits "." digits 
port   = digits 
user   = *[ uchar | ";" | "?" | "&" | "=" ] 
password  = *[ uchar | ";" | "?" | "&" | "=" ] 
urlpath  = *xchar ; depends on protocol see section 3.1 

; The predefined schemes: 

; FTP (see also RFC959) 

ftpurl   = "ftp://" login [ "/" fpath [ ";type=" ftptype ]] 
fpath   = fsegment *[ "/" fsegment ] 
fsegment  = *[ uchar | "?" | ":" | "@" | "&" | "=" ] 
ftptype  = "A" | "I" | "D" | "a" | "i" | "d" 

; FILE 

fileurl  = "file://" [ host | "localhost" ] "/" fpath 

; HTTP 

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

; GOPHER (see also RFC1436) 

gopherurl  = "gopher://" hostport [/[ gtype [ selector 
       [ "%09" search [ "%09" gopher+_string ] ] ] ] ] 
gtype   = xchar 
selector  = *xchar 
gopher+_string = *xchar 

; MAILTO (see also RFC822) 

mailtourl  = "mailto:" encoded822addr 
encoded822addr = 1*xchar    ; further defined in RFC822 

; NEWS (see also RFC1036) 

newsurl  = "news:" grouppart 
grouppart  = "*" | group | article 
group   = alpha *[ alpha | digit | "-" | "." | "+" | "_" ] 
article  = 1*[ uchar | ";" | "/" | "?" | ":" | "&" | "=" ] "@" host 

; NNTP (see also RFC977) 

nntpurl  = "nntp://" hostport "/" group [ "/" digits ] 

; TELNET 

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

; WAIS (see also RFC1625) 

waisurl  = waisdatabase | waisindex | waisdoc 
waisdatabase = "wais://" hostport "/" database 
waisindex  = "wais://" hostport "/" database "?" 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 | "?" | ":" | "@" | "&" ] 

; Miscellaneous definitions 

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" | "I" | 
       "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 

unreserved  = alpha | digit | safe | extra 
uchar   = unreserved | escape 
xchar   = unreserved | reserved | escape 
digits   = 1*digit 

Answer 7

urlparse अमान्य URL लेता है, इसे और अधिक सत्यापनकर्ता के किसी भी प्रकार की तुलना में एक स्ट्रिंग स्ट्रिंग-बंटवारे पुस्तकालय है:

पूर्णता के लिए, यहाँ (एक प्रलेखन के रूप में) के ऊपर regex के छद्म BNF है । उदाहरण के लिए:

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

स्थिति पर निर्भर करता है, यह ठीक हो सकता है ..

आप ज्यादातर डेटा पर विश्वास करते हैं, और सिर्फ प्रोटोकॉल सत्यापित करना चाहते HTTP है, तो urlparse एकदम सही है।

आप, यूआरएल वास्तव में एक कानूनी यूआरएल है बनाना चाहते का उपयोग the ridiculous regex

आप यकीन है कि यह एक वास्तविक वेब पता है बनाना चाहते हैं,

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

Answer 8

टिप्पणी है - Lepl नहीं रह गया है बनाए रखा या समर्थित है।

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 

: http://www.faqs.org/rfcs/rfc3696.html

Lepl (एक अजगर पार्सर पुस्तकालय) की नवीनतम रिलीज आरएफसी 3696. के एक कार्यान्वयन शामिल है आप की तरह यह कुछ का प्रयोग करेंगे -

आरएफसी 3696 URL के सत्यापन के लिए "सर्वोत्तम प्रथाओं" को परिभाषित करता

हालांकि वैधकर्ताओं को लेप्ल में परिभाषित किया गया है, जो एक पुनरावर्ती मूल पार्सर है, वे नियमित रूप से नियमित अभिव्यक्तियों के लिए आंतरिक रूप से संकलित होते हैं। यह दोनों दुनिया के सर्वश्रेष्ठ संयोजन को जोड़ता है - एक (अपेक्षाकृत) परिभाषा को पढ़ने में आसान है जिसे आरएफसी 3696 और के खिलाफ एक कुशल कार्यान्वयन के विरुद्ध चेक किया जा सकता है।वहाँ अपने ब्लॉग पर एक पोस्ट दिखा कि यह कैसे पार्सर को सरल है - http://www.acooke.org/lepl पर http://www.acooke.org/cute/LEPLOptimi0.html

Lepl उपलब्ध है और आरएफसी 3696 मॉड्यूल http://www.acooke.org/lepl/rfc3696.html

यह पूरी तरह से इस रिलीज़ में नया है पर दर्ज है, तो बग हो सकते हैं। यदि आपको कोई समस्या है तो कृपया मुझसे संपर्क करें और मैं उन्हें ASAP ठीक कर दूंगा। धन्यवाद।

Answer 9

मैं Django द्वारा प्रयोग किया जाता का उपयोग कर रहा है और यह बहुत अच्छी तरह से लगता है:

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) 

आप यहां पिछले संस्करण की जांच कर सकते हैं: https://code.djangoproject.com/browser/django/trunk/django/core/validators.py#L47

Answer 10

http://pypi.python.org/pypi/rfc3987 में नियमों के साथ स्थिरता के लिए नियमित अभिव्यक्ति देता है आरएफसी 3 9 86 और आरएफसी 3 9 87 (यानी, योजना-विशिष्ट नियमों के साथ नहीं)।

IRI_reference के लिए एक regexp है:

(?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 
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में एक पंक्ति: मामले की%

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

Answer 11

आजकल 90 में यदि आप अजगर से आप शायद अजगर-अनुरोधों का उपयोग में यूआरएल के साथ काम कर रहे। तो अब सवाल है "अनुरोधों से यूआरएल सत्यापन का पुन: उपयोग क्यों नहीं करें"?

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 

सुविधा:

• एक नए अंदाज़ में पहिया
• सूखी
• ऑफ़लाइन काम
• न्यूनतम संसाधन

Answer 12

संशोधित Django यूआरएल सत्यापन regex नहीं है:

+०१२३५१६४१०६१

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) 

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