PCRE has a feature called recursive pattern, which can be used to match nested subgroups. For example, consider the "grammar" Q -> \w | '[' A ';' Q* ','? Q* ']' | '<' A '>' A -&g...

I was just reading a question about how to get data inside double curly braces (this question), and then someone brought up balancing groups. I'm still not quite sure what they are and how to use t...

TL;DR: Using capturing (and in particular balancing groups) inside .NET's lookbehinds changes the obtained captures, although it shouldn't make a difference. What is it with .NET's lookbehi...

As a generically brewed example for the purpose of this question, my intent is to match some number of a's, then an equal number of b's, plus one more b. Examine the two patterns exhibited in thi...