There is a regexp extension in ext/misc/regexp.c at <https://www.sqlite.org/src/artifact/246244c714267f30> so no need to write, merely compile, load, and go ...
There is a regexp extension in ext/misc/regexp.c at <https://www.sqlite.org/src/artifact/246244c714267f30> so no need to write, merely compile, load, and go ...