Regex help please?

[Panupat Chongstitwattana]

Hi.

I have this string

path = r'P:\<various directories>\scene\ch01\seq001\s0090\anim\.......'

I want to split out the ch01, seq001 and s0090 into 3 variables (or a list). Is there a way to do this with regex in a single line? Maybe with re.split(...)

Currently I do it in 3 different steps

find = re.findall(r'ch\d\d', path)
if find: ch = find[0]

find = re.findall(r'seq\d\d', path)
if find: seq = find[0]

etc.

Thanks

[Justin Israel]

You can use a single regular expression, with capture groups:

In [1]: import re

In [2]: path = r'P:\foo\bar\biz\scene\ch01\seq001\s0090\anim\foo\bar\biz'

In [3]: match = re.search(r'(ch\d{2})\\(seq\d{3})\\(s\d{4})', path)

In [4]: if match:
...: print match.groups()
...:
('ch01', 'seq001', 's0090')

In [5]: match.group(1)
Out[5]: 'ch01'

In [6]: match.group(2)
Out[6]: 'seq001'

In [7]: match.group(3)
Out[7]: 's0090'

In [8]: match = re.search(r'ch(\d{2})\\seq(\d{3})\\s(\d{4})', path)

In [9]: print match.groups()
('01', '001', '0090')

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[Panupat Chongstitwattana]

Sorry for the late thank you Justin!

[Justin Israel]

No worries. Hope it helped.

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[Chad Dombrova]

not sure if someone answered this already, but here you go:

>>> re.findall(r'(?:ch\d{2})|(?:seq\d{2})|(?:s\d{4})',  r'P:\<various directories>\scene\ch01\seq001\s0090\anim\.......')

['ch01', 'seq00', 's0090']

{2} means repeat the pattern 2 times

?: means do not capture inside these parentheses

On Fri, Nov 8, 2013 at 5:35 AM, <narayan.si...@gmail.com> wrote:

asd

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[Justin Israel]

I had previously suggested a solution like this:

    match = re.search(r'ch(\d{2})\\seq(\d{3})\\s(\d{4})', path)

    match.groups()

    # ('01', '001', '0090')

Do you think your version, using multiple OR'd patterns might produce a lot of unwanted and non-specifically ordered matches?

    aPath = r'P:\<various directories>\scene\ch01\seq001\s0090\anim\search02_foo\apples1000.......'

    re.findall(r'(?:ch\d{2})|(?:seq\d{2})|(?:s\d{4})',  aPath)

    #  ['ch01', 'seq00', 's0090', 'ch02', 's1000']

I figure matching show/scene/shot (or variation) is a pretty common studio pattern to match and would probably be best suited as one pattern with capture groups. It might even be nice to capture named groups:

    match = re.search(r'ch(?P<ch>\d{2})\\seq(?P<seq>\d{3})\\s(?P<shot>\d{4})', path)

    match.groupdict()

    # {'ch': '01', 'seq': '001', 'shot': '0090'}

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