Regex Editor & Tester

Matches a number followed by the Dutch quantity unit 'stuk(s)' (allowing variants like 'stuks', 'stk', 'st') using a whitespace lookbehind, or matches the French piece abbreviations 'pce', 'piece' and their plurals 'pces', 'pieces' anywhere in the text. Intended for parsing quantities in bilingual Dutch/French product lists, invoices, or stock descriptions. Note the digit and lookbehind requirements only apply to the first alternative, so the French terms match even without a preceding number.