Feature request: use regular expression engine supporting lookbehind

[roman-orekhov]

Also std::regex is slow.

Lookbehinds are very handy to highlight the exact part based on context

[janwilmans]

It is true that std::regex is relatively slow, but in 14 years of Debugview++ I have not had any one give me a case where it actually mattered. Do you have a scenario?

[roman-orekhov]

No. I'm mostly interested in lookbehinds