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profile .rst say:
> Each restriction is either an integer (to select a count of lines), or a decimal fraction between 0.0 and 1.0 inclusive (to select a percentage of lines), **or a regular expression**
Actually it accept a string that will be compiled to a regex.
Profile.py also mention:
> (i.e., in addition to the old -1, 0, 1, or 2)
Which is not really helpful, to newcomers to Python who do not know what these are meant to be. Either explaining (or removing if considered old behavior that should be stopped) seem to be better alternative.
See https://github.com/python/cpython/pull/88