Extended regular expressions (ERE) for .gitignore

Question

Is there a way to use extended regular expressions(ERE) in a .gitignore file? For example I want to use the + repetition character in a .giti

Answer 1

As illustrated here and detailed in "this question", the function fnmatch() is involved to interpret glob patterns, which means regular expressions are not supported.

This is what gitignore man page mentions:

Otherwise, git treats the pattern as a shell glob suitable for consumption by fnmatch(3) with the FNM_PATHNAME flag: wildcards in the pattern will not match a / in the pathname.
For example, "Documentation/*.html" matches "Documentation/git.html" but not "Documentation/ppc/ppc.html" or "tools/perf/Documentation/perf.html".

You can see some correspondence between glob patterns and regular expressions in those questions.