Regex Tester & Validator

This regular expression is intended to match specific LibreOffice or OpenDocument file extensions, specifically .odp, .ods, and .odt. However, due to how it is written, it matches ".odp" and "ods" anywhere in a string, while only matching "odt" if it appears at the absolute end of the string. It is likely used for file upload validation or document filtering, though it might require anchoring to work perfectly for strict extension checking.