github.com/dlclark/regexp2 (go): Package regexp2 is a regexp package that has an interface similar to Go's framework regexp engine but uses a more feature full regex engine behind the scenes.  It doesn't have constant time guarantees, but it allows backtracking and is compatible with Perl5 and .NET. You'll likely be better off with the RE2 engine from the regexp package and should only use this if you need to write very complex patterns or require compatibility with .NET.
Keywords: go|regex|regex-engine|regexp|regular-expression|regular-expression-engine