[dsymonds]

The standard regexp package, unlike PCRE, is actually a proper regular expression parser/matcher. Anything doing backtracking is at risk of exponential blowup and isn't safe.

https://swtch.com/~rsc/regexp/regexp1.html

[endymi0n]

which is exactly what I meant with less specialized but safe :)

[jonlawlor]

It is also often much faster than pcre.