graywolf, 3 months ago (edited 3 months ago)

@louis I think func() is evaluated as func' followed by empty capture group. I tried C-x p g for just func()' and it seems to do what you want.

EDIT: https://www.gnu.org/software/emacs/manual/html_node/emacs/Regexp-Backslash.html seems relevant.

RogerBW, 3 months ago (edited 3 months ago)

@louis I don't know this specific context but I've worked with regexp libraries that took () as literal and () as grouping operators (e.g. in sed and nvi).

rahguzar, 3 months ago

@RogerBW @louis this seems to be case in #elisp My way of dealing with regexes in Elisp is to use rx and (rx "func()") outputs "func()".

ramin_hal9001, 3 months ago (edited 3 months ago)

> "I've worked with regexp libraries that took () as literal and () as grouping operators (e.g. in sed and nvi)"

@RogerBW @louis this is the correct answer in the case of Emacs. Here "(...)" are grouping operators, do not use backslashes if you want to match literal paren characters. Another good way to ensure you mean literal parens is to write "[(][)]", i.e. place them in character sets.

Confusingly, Emacs treats "+" as "match one or more" and "+" a literal character, which is the opposite of how Sed and "grep -e" does it. Apart from that, the escape codes in Emacs work pretty much the same as Sed or "grep -e".