Umm no, you're totally wrong there. The regexp support in mIRC is taken from PCRE, not from Perl. The php function which was mentioned is based on PCRE. Therefore, it should be 100% possible for this to be added in mIRC. And anyway, the fact that it is not internally supported by PCRE doesn't mean anything either. The code that is needed to handle this needs to be in mIRC, not in PCRE. Just like how mIRC can use a regexp in /filter, yet PCRE does not have a filter command.
