Based on the "lazyregexp" package in golang.org/x/mod;
https://cs.opensource.google/go/x/mod/+/refs/tags/v0.19.0:internal/lazyregexp/lazyre.go;l=66-78
This package allows defining regular expressions that should not be
compiled until used, but still providing validation to prevent
invalid regular expressions from producing a panic at runtime.
This is largely a copy of the package from golang.org/x/mod,
with FindAllStringSubmatch and ReplaceAllStringFunc added
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
