Good Regex library written in C

https://github.com/monolifed/tiny-regex-c

supported syntax
^ $ . \s \S \d \D \w \W [^ABC0-9] [ABC0-9] * + ? *? +? ?? {m,n} {m,n}?

2019/06/03 更新
After doing simple test, it seems that it can support normal cases.