Git ignore random numeric folders name

Question

I want to ignore some folders generated with random numeric names even float numbers, but I do not know how to peek them to include in the .gitignore file

Answer 1

How about something like:

* //Ignore everything

!*[!0-9.]* //Except things with some characters besides numbers (and period, for decimals) in them
!*.*.* //And except things with two periods, since these can't be numbers

Note that these are shell globs instead of regular expressions.

Answer 2

Ideally, if gitignore supported regular expression, it might have been possible to use a regex as detailed here.

However, from the official git documentation here :

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".

Regular expression is not supported at the time of this writing (2016-11-15) and the expressions in gitignore are interepreted as shell glob patterns.

If the random folders being generated do not share a common parent directory and there is nothing else common in their names, then this does seem to be possible.

Is it possible to generate the folders with a common prefix or suffix so that that can be used in the .gitignore?