Regex Tester & Validator

This regex uses the global and multiline flags to match specific two-letter country codes: "uk", "es", and "de". However, due to operator precedence, it literally matches "uk" at the start of a line, "es" anywhere in the string, or "de" at the end of a line. It does not strictly isolate these exact words unless rewritten as `^(?:uk|es|de)$`. It is intended for validating or filtering a predefined subset of European country codes.