How to decipher :re.split(r"(\(\([^)]+\)\))" in the example
MRAB
python at mrabarnett.plus.com
Thu Jul 10 13:01:18 EDT 2014
On 2014-07-10 16:37, fl wrote:
> Hi,
>
> This example is from the link:
>
> https://wiki.python.org/moin/RegularExpression
>
>
> I have thought about it quite a while without a clue yet. I notice that it uses
> double quote ", in contrast to ' which I see more often until now.
> It looks very complicated to me. Could you simplified it to a simple example?
>
>
> Thanks,
>
>
>
>
>
> import re
> split_up = re.split(r"(\(\([^)]+\)\))",
> "This is a ((test)) of the ((emergency broadcasting station.))")
>
>
> ...which produces:
>
>
> ["This is a ", "((test))", " of the ", "((emergency broadcasting station.))" ]
>
No it doesn't; you've omitted the final string.
The regex means:
( Start of capture group.
\( Literal "(".
\( Literal "(".
[^)]+ One or more repeats of any character except a literal ")".
\) Literal ")".
\) Literal ")".
) End of capture group.
.split returns a list of the parts of the string between the matches,
and if, as in this example, there are capture groups, then those too:
[
'This is a ', # The part before the first
# match.
'((test))', # The first match (group 1).
' of the ', # The part between the first
# and second matches.
'((emergency broadcasting station.))', # The second match.
'' # The part after the second
# match.
]
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