In article <9p4a4f$kdd$1@[...].uk> ,
Ralph Corderoy <ralph@[...].uk>  wrote:
> 
> An easy, sure fire way for any programmer to learn regex concepts is to
> read Kernighan and Plauger's _Software Tools_ where, amongst many other
> interesting topics, they implement a regex pattern matcher and preceed
> to use it in their versions of grep, ed, etc.

The problem is that this gives a narrow view of regexes and doesn't show
the full power available in complex regex languages in Perl/Python.
Much better is _Mastering Regular Expressions_ by Jeffrey Friedl, though
it badly needs freshening.
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