Regex Tester & Validator

Matches a TV season marker: a single character 'S', 's', or underscore, followed by exactly two digits captured as the season number, then a trailing 'E', 'e', 'x', space, or underscore. Commonly used to parse season/episode notation (e.g., 'S01E' in 'Show S01E02') from video filenames, with the two-digit season stored in capture group 1. Note the redundant quantifiers {1,1} and {2,2}, which simply mean one and exactly two repetitions.