[Tutor] Regexp question

[Ovidiu Bivolaru]

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Thanks a lot :) !! That's it !

Regards,
Ovidiu


On Mon, 2003-05-19 at 17:49, Kristoffer Erlandsson wrote:
> On Mon, May 19, 2003 at 05:30:15PM +0300, Ovidiu Bivolaru wrote:
> > Hi all,
> >=20
> > I'm trying to parse some HTML forms to get the values from "name" and
> > "value" attributes and then to add them in a list. I'm encountering a
> > problem with the regular expressions and I can't figure out why the
> > expression is invalid.
> >=20
> > Bellow is the code that I'm using:
> >     for lines in buffer.readlines():
> >       print lines
> >       regexp =3D 'value=3D"(.*)?"\s*name\s*=3D\s*"(.*:\d+:\d+)?"'
> >       print regexp
> >       p =3D re.search(regexp,lines)
> >=20
> > The error message is:
> >     p =3D re.search(regexp,lines)
> >   File "/usr/lib/python2.2/sre.py", line 137, in search
> >     return _compile(pattern, flags).search(string)
> >   File "/usr/lib/python2.2/sre.py", line 229, in _compile
> >     raise error, v # invalid expression
> > error: nothing to repeat
> >=20
> > Can anybody tell me what is wrong with the regular expression?? Also,
> > are any other possibilities to parse the HTML using functions already
> > implemented  (i.e. HTMLPasrse module) ??
> >=20
>=20
> The first '?' in your regexp shouldn't be there. Since '*' means "0 or
> more times" the part "(.*)?" of your regexp says "(any character zero or
> more times) zero or one time", using some weird paranthesis-notation. So
> remove that '?' and you won't get the error message. Note that I haven't
> checked your regexp so it matches what you think, I just got rid of the
> error message.
>=20
> HTH,
> Kristoffer

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