> > 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 ?
I am not expert about REs yet, but I suggest you to use the re.VERBOSE
and split your RE in parts, like this:
example = re.compile(r"""^ \s* # must start at the beginning +
optional whitespaces
( [\[\(] ) # Group 1: opening bracket
\s* # optional whitespaces
( [-+]? \d+ ) # Group 2: first number
\s* , \s* # optional space + comma +
optional whitespaces
( [-+]? \d+ ) # Group 3: second number
\s* # optional whitespaces
( [\)\]] ) # Group 4: closing bracket
\s* $ # optional whitespaces + must
end at the end
""", flags=re.VERBOSE)
This way you can debug and mantain it much better.
Bye,
bearophile
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