Regex Tester & Validator

Matches the standalone word 'test' (case-insensitive) using custom Unicode-aware word boundaries built from a negative lookbehind and lookahead. Unlike \b, which only treats ASCII [A-Za-z0-9_] as word characters, this pattern prevents matches adjacent to any Unicode letter (including umlauts like ä, ö, ü), digit, or underscore. For example, it won't match the 'test' inside 'Ütest', fixing \b's shortcomings in multilingual text. Useful for whole-word searching in non-English content.