On POSIX systems the OS (well, libc) already provides a C regex library: https://pubs.opengroup.org/onlinepubs/9699919799/functions/regcomp.html https://pubs.op

On POSIX systems the OS (well, libc) already provides a C regex library: https://pubs.opengroup.org/onlinepubs/9699919799/functions/regcomp.html https://pubs.opengroup.org/onlinepubs/9699919799/functions/r... Whether you want to use that is another question.