On Feb 7, 12:19 am, "Alf P. Steinbach" <[email protected]> wrote:
>
> I haven't used regexps in Python before, but what I did was (1) look in the
> documentation,
Hm. I checked in the repl, running `import re; help(re)` and the docs
on the `sub()` method didn't say anything about using back-refs in the
replacement string. Neat feature though.
> (2) check that it worked.
>
> <code>
> import re
>
> text = (
> "Lorem [ipsum] dolor sit amet, consectetur",
> "adipisicing elit, sed do eiusmod tempor",
> "incididunt ut [labore] et [dolore] magna aliqua."
> )
>
> withbracks = re.compile( r'\[(.+?)\]' )
> for line in text:
> print( re.sub( withbracks, r'{\1}', line) )
> </code>
>
Seems like there's magic happening here. There's the `withbracks`
regex that applies itself to `line`. But then when `re.sub()` does the
replacement operation, it appears to consult the `withbracks` regex on
the most recent match it just had.
Thanks.
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