Regex Tester & Validator

This regular expression attempts to match WordPress image upload paths from 2019 (specifically intended for months 09 through 12) with filenames starting with 'dsc'. However, due to incorrect syntax, the [(9|10|11|12)] portion acts as a character class that literally matches combinations of digits 0, 1, 2, 9, and parentheses. It expects multiple slashes between directory segments and looks for files ending in 'jpg'.