On 02-Nov-2007, at 16:30, Aaron J. Grier barely brushed the surface
of the potential pool of hate that awaits one who wants to grok
regular expressions in all fullness...
GNU: \> , \<
Early extension, originated in "vi". Breaks traditional regexps.
BSD: [[:>:]] , [[:<:]]
POSIX-style, but not POSIX. provides better compatibility with
traditional regexps by overloading character classes.
Perl regexps are a third style.
GNU has about 30 options to turn on and off different sets of
extensions.
There's a couple of different Java regexps, one of which is an
improper subset of GNU regexp.
Most of these have basic and enhanced versions.
AmigaDOS file matching is actually a regular expression language with
a unique syntax.
SNOBOL and derivatives.
There are LISP and Scheme regular expression languages, which are of
course s-expressions.
Icon, which isn't a SNOBOL derivative but created by the same bloke,
makes the operations involved in regular expression evaluation part
of the language.
Prolog of course takes pattern matching to a whole new level.
