regex question

[Günter Jantzen]

"Rajarshi Guha" <rajarshi at presidency.com> schrieb im Newsbeitrag
news:pan.2004.04.06.00.54.58.864209 at presidency.com...
> Hi,
>   this is not specifically a Python question but since I'm doing it in
> Python I thought I'd ask here.
>
> I have a BibTeX file with entries of the form
>
> @Article{dkapp3,
>   author = {Kier, L.B},
>   title = {Distinguishing Atom Differences in a Molecular Graph Index},
>   journal = {Quant. Struct.-Act. Relat. Pharmacol.,Chem. Bio},
>   year = {1986},
>   OPTkey = {},
>   volume = {5},
>   OPTnumber = {},
>   pages = {7-12},
>   OPTmonth = {},
>   OPTnote = {},
>   OPTannote = {}
> }
>
> (it also has entries for Book and InBook)
>
> I have an re that is able to get each bibitem: @Article{(.*?)}\n
> From the result I can easily get the key using: @.+?\{(.+?),
>
> I was wondering if it would be possible to do the two things in one re.
> That is, first get the string of 1 bibitem and then within that get the
> key from the matched bibitem.
>
> I think I should be using a lookbehind(?) but I'm not sure.
>
> Any pointers would be appreicated
>
> Thanks
>
>
> --
> -------------------------------------------------------------------
> Rajarshi Guha  <rajarshi at presidency.com> <http://jijo.cjb.net>
> GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04  06F7 1BB9 E634 9B87 56EE
> -------------------------------------------------------------------
> Q:  What's purple and commutes?
> A:  An abelian grape.
>

Hello Rajarshi,

I think the following program is not very useful, if the entries differ only
a bit, but it answers your question

import re

rx_bibtex= re.compile(
'''\@Article\{(?P<article>[^,]+),
 *author = \{(?P<author>[^}]*)\},
 *title = \{(?P<title>[^}]*)\},
 *journal = \{(?P<journal>[^}]*)\},
 *year = \{(?P<year>[^}]*)\},
 *OPTkey = \{(?P<OPTkey>[^}]*)\},
 *volume = \{(?P<volume>[^}]*)\},
 *OPTnumber = \{(?P<OPTnumber>[^}]*)\},
 *pages = \{(?P<pages>[^}]*)\},
 *OPTmonth = \{(?P<OPTmonth>[^}]*)\},
 *OPTnote = \{(?P<OPTnote>[^}]*)\},
 *OPTannote = \{(?P<OPTannote>[^}]*)\}
\}''')



s='''@Article{dkapp3,
  author = {Kier, L.B},
  title = {Distinguishing Atom Differences in a Molecular Graph Index},
  journal = {Quant. Struct.-Act. Relat. Pharmacol.,Chem. Bio},
  year = {1986},
  OPTkey = {},
  volume = {5},
  OPTnumber = {},
  pages = {7-12},
  OPTmonth = {},
  OPTnote = {},
  OPTannote = {}
}
'''

mo = rx_bibtex.match(s)
if mo:
    print mo.groupdict()


Günter