What people name REGEX comes in 3 main dialects:

The above also have dialect/implementation variants.

And there are the different REGEX-notations used in other sciences like linguistics, which Friedl AFAIR does not include in his book.

Helmut Wollmersdorfer

In reply to Re^3: Parsing and translating Perl Regexes by wollmers
in thread Parsing and translating Perl Regexes by LanX

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