问题
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 .gitignore file. Is there a way to do that?
回答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 theFNM_PATHNAMEflag: 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.
回答2:
The .gitignore (and other) files use filename globs, not regular expressions.
I very much doubt you can convince the git hackers to change that: Just too ingrained by now, and globs are much more familiar as filename matchers.
来源：https://stackoverflow.com/questions/15672613/extended-regular-expressions-ere-for-gitignore