Python re expr from Perl to Python

[Paddy]

Paddy wrote:

> Michael M. wrote:
>
> > In Perl, it was:
> >
> >
> >    ## Example: "Abc | def | ghi | jkl"
> >    ##       -> "Abc ghi jkl"
> >    ## Take only the text betewwn the 2nd pipe (=cut the text in the 1st
> > pipe).
> >    $na =~ s/\ \|(.*?)\ \|(.*?)\ \|/$2/g;
> >
> >    ## -- remove [ and ] in text
> >    $na =~ s/\[//g;
> >    $na =~ s/\]//g;
> >    # print "DEB: \"$na\"\n";
> >
> >
> > # input string
> > na="Abc | def | ghi | jkl [gugu]"
> > # output
> > na="Abc ghi jkl gugu"
> >
> >
> > How is it done in Python?
>
> Here is how to do it without regexps in python.
> The first and last line below are all that are needed. The others show
> intermediate expressions that lead to the result.
>
> >>> from itertools import groupby
>
> >>> na="Abc | def | ghi | jkl [gugu]"
> >>> [(g[0], ''.join(g[1])) for g in groupby(na, lambda c: c not in ' \t|[]')]
> [(True, 'Abc'), (False, ' | '), (True, 'def'), (False, ' | '), (True,
> 'ghi'), (False, ' | '), (True, 'jkl'), (False, ' ['), (True, 'gugu'),
> (False, ']')]
> >>> [''.join(g[1]) for g in groupby(na, lambda c: c not in ' \t|[]') if g[0]]
> ['Abc', 'def', 'ghi', 'jkl', 'gugu']
>
> >>> ' '.join(''.join(g[1]) for g in groupby(na, lambda c: c not in ' \t|[]') if g[0])
> 'Abc def ghi jkl gugu'
> >>>
>
>
> - Paddy.

And I leave the deletion of def to the reader :-)

(i.e: I missed that bit and adding it in would make a long
comprehension too long to comprehend).