Re: [Emacs-diffs] master 938d252 4/4: Make regex matching reentrant; update syntax during match

[Paul Eggert]

If we're going to go to that much work, why not use glibc regex? It uses a DFA 
and falls back on backtracking only when needed. Although glibc regex isn't 
maintained that well, it's at least maintained, which TRE is not. And it does 
have some advantages: it has an API that is like Emacs src/regex.c, and it won't 
have any licensing issues. Its main disadvantage (it doesn't support split 
buffers) could be overcome fairly easily, either by adding support for that back 
into the library, or arranging for a single array whenever the regex matcher is 
called.