Build, test, and debug regular expressions
Matches one or more of the characters '[', '^', or '/' followed by a captured run of any characters, then a slash, a three-digit number in the 300-999 range, and a trailing hyphen. Typically used in redirect rule configurations to capture URL paths like /item/yyy-name-and-name paired with HTTP 3xx-9xx status codes. The gm flags apply matching globally across each line.