ASPN : Rx Cookbook : Finding URLs in text -- the COMPLETE way

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Title: Finding URLs in text -- the COMPLETE way
Submitter: Ken Simpson (other recipes)
Last Updated: 2001/05/28
Version no: 1.0
Category: Networking

4 stars 5 vote(s)

Description:

This substitution expression, posted by Abigail to comp.lang.perl.misc on 08/14/2000,
matches URLs and turns them into HTML links. This regular expression follows
the complete URL grammar as defined in RFC 1738.

Usage: Text Source

$string =~ s<
(?:http://(?:(?:(?:(?:(?:[a-zA-Z\d](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?)\.
)*(?:[a-zA-Z](?:(?:[a-zA-Z\d]|-)*[a-zA-Z\d])?))|(?:(?:\d+)(?:\.(?:\d+)
){3}))(?::(?:\d+))?)(?:/(?:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[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})|[:@&=+])*))*)?)))
><<a href = "$1">$1</a>>gx;

The license for this recipe is available here.

Discussion:

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Number of comments: 11

Interesting, but totally unusable, David Levin, 2001/06/03
This is more appropriate for a Perl Journal competition, but not as an example of what should be submitted. I learned nothing from it, cannot, and will not use it. I fail to see why it deserves the editor's choice status.
Add comment

Unusable?, Ray Graham, 2001/06/04
I beg to differ. The regEx definately is usable, though I agree that, from the author's comments, you can't learn much easily. The author just needed to show the regEx and then break it down for those wanting to know more. Depends on why you use the Rx Cookbook. If you use it solely to learn, then this post is meaningless. But if you are looking for the A+ solution to a very common problem, then this regEx will save you weeks of frustration.
Add comment

Minor typo found, Roy Beatty, 2001/08/10
On line 15, a ":" should be inserted in column 26.

...

Nah, just kidding. But I'm curious: Does this entry hold the record for being the longest regex with a useful purpose?
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Rx Toolkit, Serge Sozonoff, 2001/12/12
Anyone thrown this into the Rx Toolkit in Komodo yet :-) Serge
Add comment

Slight modification required for https, John Liu, 2002/03/13
Change http to https? and the regular expression works beautifully.

If you are after learning what this regular expression does, try reading the RFC (here: http://www.w3.org/Addressing/rfc1738.txt) instead. This regular expression I imagine would be a direct translation of the BNF grammar defined.

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I couldn't get it to work, neil Burnett, 2002/12/16
Did anyone actually test this regular expression? Here is what I got, and I don't think I even want to start to debug it:-): Sequence (? ...) not recognized in regex; marked by Did anyone actually test this regular expression? Here is what I got, and I don't think I even want to start to debug it:-): Sequence (? ...) not recognized in regex; marked by
Add comment

Mistakes, Greg Hart, 2003/07/31
There's only a couple mistakes that I could find. When copying the code, it retains the line breaks, so those have to be deleted when you copy. On the last line, it's supposed to be $& not $1. Just thought I'd let everybody know.
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another notes, Slava Iutin, 2004/10/22
Yes, also it does not match https and ftps protocols. Very easy to change 'http' with 'https?' and 'ftp' with 'ftps?'
Add comment

much easier, Slava Iutin, 2004/10/22
/\bhttps?:[^\s<>\"]+[\w\/]/i
Add comment

Had to add another grouping for it to work in python, Sam Peterson, 2005/02/28
I finally got this to work in python. I had to add another layer of parentheses around the entire thing and remove all the breaks. 'Twas a nightmare. Since I don't have an easy way of dispaying the pattern all on one line without completely hosing this page, I've encoded it in base64, then decoded it into a variable and finally compiled it as a pattern. It seems to do the job though it returns two results, the first of which is the match, the second, an empty string. Does the job, but I'm through playing with this for now. It would have been nice if the author of the regex had done something similar and more cross platform in the first place (not knocking their work though, it's a very effective RE).

Here's what I came up with in python:

#!/usr/bin/python

import base64, re

pattern_in_base64 = r"""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PykpKSk="""

pattern = base64.decodestring(pattern_in_base64)
print pattern
matcher = re.compile(pattern)
the_string = 'http://www.example.com/ mailto:dude@example.com news:alt.example'
matches = matcher.findall(the_string)

print "Now printing matches"
for match in matches:
    print "Found url %s" % match[0]

This seems to do the trick for the most part, however it seems to produce two results with findall, one with the url, one an empty string. I'm way too scared to play with it further to figure out what to do, suffice to say, match[0] will get the job done.
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super!, nicolas pioli, 2005/07/12
j'ai utilisé avec succès vos travaux dans un script python: cf. recipe 252508 de doug tolton!
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