Build, test, and debug regular expressions
Matches a single special character or punctuation mark, including braces, brackets, slashes, math operators, quotes, backslash, and Korean Hangul consonants (ㄱ-ㅎ). Typically used with global replace (gm flags) to strip special characters and standalone Korean consonants from strings, useful for sanitizing user input, cleaning filenames, or normalizing Korean text data.