I think some of the warnings are valid, but not all. What regular expression standard is being followed? If it's POSIX then valid values for QUOTED_CHAR are documented in https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html
I think some of the warnings are valid, but not all. What regular expression standard is being followed? If it's POSIX then valid values for QUOTED_CHAR are documented in https:/ /pubs.opengroup .org/onlinepubs /9699919799/ basedefs/ V1_chap09. html