I think it would be more productive to add PCRE (
Perl Compatible Regular Expressions) support.
This is something I can implement right now in FlashFXP v5.
My thought is to add support using the following syntax "regex:<pattern>", this way both can co-exist.
Here's a v5 build with PCRE support using the regex:<pattern> syntax as mentioned above.
http://get.flashfxp.com/5.0/FlashFXP50_3724_Setup.exe
Currently regex is limited to the skip list and highlights but I will add support for everywhere else in the next update probably tomorrow or monday.