regex with Hex

[Sylver]

I am having problems with regex with hex codes. I am pretty sure there is something 'obvious' I am missing, but what?

I want to do some file manipulation with exotic formats (some unicode, some not).

The unicode bit is causing me headaches no end. I tried searching for 4 digits hex codes like \x{C200}, but the darn thing never matches.

Does someone know a good tutorial for doing regex with Hex codes?

[eelixduppy]

Here is a good tutorial [webmasterworld.com] in general, taken from our library [webmasterworld.com].

[Sylver]

Thanks, but I am afraid I need something a little more advanced, specifically taking up the issue of 4 digit hex codes and unicode handling.

[coopster]

I think you'll find some direction/insight on the Perl-compatible regular expression (PCRE) [php.net] manual pages. Look specifically at the Pattern Modifiers and Pattern Syntax pages.