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main: revise mgroup regex flag
- It seeems that the initial value for the flag can crash ctags.
- The range of the value passed to the flag is not verified well.
Thank you very much for pointing out this. I found a critical bug in the code about mgroup. I will fix.
Originally posted by @masatake in https://github.com/universal-ctags/ctags/pull/2916#r597205420
docs/optlib.rst must be updated when fixing this issue.