Regex Tester & Validator

Matches filenames consisting of any characters, an underscore, exactly three digits, and a .wmo extension (e.g., dungeon_042.wmo). This detects World of Warcraft WMO (World Map Object) group files, where a root model is named like model.wmo and its group components follow model_XXX.wmo. The global and multiline flags let it scan entire file listings or directory output, finding every group file at once.