regex-rs: safe wrapper forPOSIX regular expressions API (provided by libc on POSIX-compliant OSes)

use regex_rs::*;let pattern ="This( often)? repeats time and again(, and again)*\\.";let compilation_flags =CompFlags::EXTENDED;let regex =Regex::new(pattern, compilation_flags).expect("Failed to compile pattern as POSIX extended regular expression");let input ="This repeats time and again, and again, and again.";// We're only interested in the first match, i.e. the part of text// that's matched by the whole regexlet max_matches =1;let match_flags =MatchFlags::empty();let matches = regex.matches(input, max_matches, match_flags).expect("Error matching input against regex");// Found a matchassert_eq!(matches.len(),1);// Match spans from the beginning to the end of the inputassert_eq!(matches[0].start_pos,0);// `end_pos` holds one-past-the-end indexassert_eq!(matches[0].end_pos, input.len());

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