Regex Editor & Tester

This regex matches identifiers following the pattern 'e' + one digit + 'r' + one or two digits + 'p' + one or two digits (e.g., e5r12p3). It is useful for validating or extracting structured codes, such as row/position references in data files, configuration keys, or inventory tracking systems. The pattern enforces a fixed prefix and variable-length numeric segments, making it suitable for parsing log entries or user input where such identifiers appear.