RegEx match all occurrences inside specific string

Question

I try to match a specific string: \slash only inside a given substring (in this case inside \lstinline{} confined by brackets):

lorem \lstinline{Foo\slash Bar\slash Foo} ipsum but \slash here is okay

desired output is lorem \lstinline{Foo Bar Foo} ipsum but \slash here is okay. See https://regex101.com/r/UgKvps/1

RegEx Flavour could be Python or any other really.

Here is a [Perl variant](https://stackoverflow.com/questions/48105521/replace-multiple-occurrences-between-two-strings) — Wiktor Stribiżew, Apr 28 '21 at 20:56
@WiktorStribiżew thanks! I don‘t understand it but this will work. — karkraeg, Apr 28 '21 at 21:02

Jan · Accepted Answer · 2021-04-28T21:13:11.530

2

Speaking of Python, you could use the newer regex module which supports \G and \K:

import regex as re

rx = re.compile(r'(?:\G(?!\A)|\\lstinline\{)[^{}]*?\K\\slash')

latex = "lorem \lstinline{Foo\slash Bar\slash Foo} ipsum but \slash here is okay"
latex = rx.sub('', latex)

print(latex)

This yields

lorem \lstinline{Foo Bar Foo} ipsum but \slash here is okay

Note that this won't work with nested latex commands (e.g. \textbf{...}).
See a demo on regex101.com.

edited Apr 28 '21 at 21:13

answered Apr 28 '21 at 21:06

Jan

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Thanks, didn't know of https://pypi.org/project/regex/ ! – karkraeg Apr 28 '21 at 21:09
@karkraeg: Brilliant module - worth looking into, really. – Jan Apr 28 '21 at 21:10

RegEx match all occurrences inside specific string

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