String Regex problem

[Fazer]

Hello,

I have a string which has a url (Begins with a http://) somewhere in
it. I want to detect such a url and just spit out the url. Since I
am very poor in regex, can someone show me how to do it using a few
examples?

Thanks a lot!

[djw]

Re: String Regex problem

Fazer wrote:[color=blue]
> Hello,
>
> I have a string which has a url (Begins with a http://) somewhere in
> it. I want to detect such a url and just spit out the url. Since I
> am very poor in regex, can someone show me how to do it using a few
> examples?
>
> Thanks a lot![/color]

I would look here to improve your re-ex skills:

http://www.amk.ca/python/howto/regex/

Also, I find Kodos to be invaluable in developing and debugging regexs.
Highly recommended.

http://kodos.sourceforge.net

Of course, you could just use urlparse in the standard library...

Good luck,

Don

[Skip Montanaro]

Re: String Regex problem

[color=blue][color=green]
>> Since I am very poor in regex, can someone show me how to do it using
>> a few examples?[/color][/color]

Don> http://www.amk.ca/python/howto/regex/
...
Don> http://kodos.sourceforge.net

If you're a Mac Python person there's also Dinu Gherman's excellent
RegexPlor:

http://starship.python.net/crew/gherman/RegexPlor.html

Even if you're not, it's worth popping over there to watch the MPEG clip of
RegexPlor in action.

Skip

[Andrei]

Re: String Regex problem

Skip Montanaro wrote on Mon, 24 Nov 2003 21:35:48 -0600:
[color=blue][color=green][color=darkred]
> >> Since I am very poor in regex, can someone show me how to do it using
> >> a few examples?[/color][/color]
>[/color]
<snip>[color=blue]
> Don> http://kodos.sourceforge.net
>
> If you're a Mac Python person there's also Dinu Gherman's excellent
> RegexPlor:
>
> http://starship.python.net/crew/gherman/RegexPlor.html[/color]
<snip>

I'm biased here, but Kiki (but http://project5.freezope.org/kiki) is
cross-platform and doesn't depend on Qt but on wxPy which is much easier
for Windows users.

Anyway, here's a regex I ripped out of my own code - you might want to
simplify it though:

"""Regex for finding URLs:
URL's start with http(s)/ftp/news ((http)|(ftp)|( news))
followed by ://
then any number of non-whitespace characters including
numbers, dots, forward slashes, commas, question marks,
ampersands, equality signs, dashes, underscores and plusses,
but ending in a non-dot and non-plus!

Result:

(?:http|https|f tp|news)://(?:[@a-zA-Z0-9,/%:\&+#\?=\-_~;]+\.*)+[a-zA-Z0-9,/%:\&#\?=\-_]

Tests:
Plain old link: http://www.mail.yahoo.com.
Containing numbers: ftp://bla.com/di~ng/co.rt,39,%93 or other
Go to news://bl_a.com/?ha-h+a&query=tb for more info.
A real link: <a href="http://x.com">http://x.com</a>.
ftp://verylong.org/url/must/be/chopp...itwontfit.html
(long one)
<IMG src="http://b.com/image.gif" /> (a plain image tag)
<a href=http://fixedlink.com/orginialinvalid .html>fixed</a> (original
invalid HTML)
Link containing an anchor
<b>"http://myhomepage.com/index.html#01"</b>.
"""

--
Yours,

Andrei

=====
Mail address in header catches spam. Real contact info (decode with rot13):
cebwrpg5@jnanqb b.ay. Fcnz-serr! Cyrnfr qb abg hfr va choyvp cbfgf. V ernq
gur yvfg, fb gurer'f ab arrq gb PP.

[Fazer]

Re: String Regex problem

djw <dwelch91.nospa m@comcast.net> wrote in message news:<fSzwb.293 286$HS4.2642954 @attbi_s01>...[color=blue]
> Fazer wrote:[color=green]
> > Hello,
> >
> > I have a string which has a url (Begins with a http://) somewhere in
> > it. I want to detect such a url and just spit out the url. Since I
> > am very poor in regex, can someone show me how to do it using a few
> > examples?
> >
> > Thanks a lot![/color]
>
> I would look here to improve your re-ex skills:
>
> http://www.amk.ca/python/howto/regex/
>
> Also, I find Kodos to be invaluable in developing and debugging regexs.
> Highly recommended.
>
> http://kodos.sourceforge.net
>
> Of course, you could just use urlparse in the standard library...
>
> Good luck,
>
> Don[/color]

Wow awesome! Thanks a lot for kodos. I hope I find it useful. I
have actually found a better solution rather than using regex it self.

Here's my solution and I think it works well:
[x for x in moo.split(' ') if x.startswith('h ttp://')]