suggest pcre

[faceair]

https://www.pcre.org/
The golang standard library uses the RE2 engine, which is not syntactically compatible with pcre. Some systems only support pcre regular expressions, so I hope c2go can convert and support the pcre library.

[xiezhenye]

https://github.com/PCRE2Project/pcre2

A pure go pcre2 port will be great.