Build, test, and debug regular expressions
Matches the literal string 'ua/' — the Ukrainian language code 'ua' followed by a forward slash, which is captured in group 1 for reuse in replacements. Commonly used in find-and-replace workflows to convert or verify localized URL path segments, such as switching /ru/ routes to /ua/ on multilingual websites. The g and m flags ensure every occurrence is matched across all lines of text.