Python has `re.VERBOSE` (`re.X` is short form). PCRE, Rust `regex` crate, Ruby have `x` flag (possibly other flavors too) Last I checked, JavaScript doesn't h

Python has `re.VERBOSE` (`re.X` is short form). PCRE, Rust `regex` crate, Ruby have `x` flag (possibly other flavors too) Last I checked, JavaScript doesn't have it. But, you can use normal string with comments: https://stackoverflow.com/q/15463257 https://stackoverflow.com/q/15463257 BRE/ERE don't have it.