[fpc-pascal] regex vs synregexpr unit

[Bihar Anwar]

OK guys, after contemplating all your suggestions, I decide to follow the SynEdit way, that is, synregexpr unit. I suppose this unit tends to get more maintenance in the future.

Concerning the C++ PCRE library, it is the most full-featured reg-expr implementation, but calling C++ functions from FPC code in a cross-platform way is complex enough and causes of possible crash will be hard to investigate.

Cheers.