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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