regex problem

km srikrishnamohan at gmail.com
Wed Nov 22 21:19:03 CET 2006


HI Tim,

oof!
thats true!

thanks a lot.
Is there any tool to simplify building the regex  ?

regards,
KM

On 11/23/06, Tim Chase <python.list at tim.thechases.com> wrote:
>
> > line is am trying to match is
> > 1959400|Q2BYK3|Q2BYK3_9GAMM Hypothetical outer membra    29.9    0.00011
> 1
> >
> > regex i have written is
> > re.compile
> >
> (r'(\d+?)\|((P|O|Q)\w{5})\|\w{3,6}\_\w{3,5}\s+?.{25}\s{3}(\d+?\.\d)\s+?(\d\.\d+?)')
> >
> > I am trying to extract 0.0011 value from the above line.
> > why doesnt it match the group(4) item of the match ?
> >
> > any idea whats wrong  with it ?
>
> Well, your ".{25}\s{3}" portion only gets you to one space short
> of your 29.9, so your "(\d+..." fails to match " 29.9" because
> there's an extra space there.  My guess (from only one datum, so
> this could be /way/ off base) would be that you mean "\s{4}" or
> possibly "\s{3,4}"
>
> It seems like a very overconstrained regexp, but it might be just
> what you need to isolate the single line (or class of line)
> amongst the chaff of thousand others of similar form.
>
> -tkc
>
>
>
>
>
>
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