Sunday, August 14, 2022

Re: Regex with backslashes in a collection

On 2022-08-14, JohnBeckett wrote:
> > [\[] is a collection containing two characters, \ and [
>
> Yes, that's what my test shows. The problem is that the pattern \\[\[] finds "\
> \" and "\[" but not "\".

Right. Your pattern says to find a \ followed by one of the
items of the collection containing \ and [. So, it will match
either of

\\
\[

but not a single \ unless it is immediately followed by a [. If you
want it to also match a single \, you could use this:

\\[\[]\?

which will match \ followed by zero or one of \ or [.

Regards,
Gary

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