About Regex Tester
Test a regular expression against sample text with live highlighting, a match list, and named capture groups broken out per match. Flags are toggled with one click. Everything happens locally in your browser: nothing is uploaded, stored, or logged. This focused Regex Tester page is designed for developers and data workers building patterns for validation, extraction, search, and text cleanup. It opens directly to the working tool, rather than hiding the function inside a general converter or account dashboard.
The source is evaluated by a purpose-built parser or browser API in the current tab; it is not submitted to a remote formatter, compiler, or logging service. Your filename and file contents stay on the device. There is no upload queue, temporary cloud copy, account record, or server-side conversion job to delete later. That makes the tool practical for personal records, work material, and drafts that should not be handed to an unknown processing service.
The operation stays focused on live matching with highlighting. You can inspect the result immediately and repeat the task with different settings without a quota or watermark. Processing speed and maximum size depend on your browser and available device memory, which is the honest trade-off for doing the work locally.
FileForge charges nothing for this tool and does not add a watermark. Once the page and its processing engine have loaded, the operation can continue without sending the file over the network. Use the numbered steps below, download the result, and review it before replacing an original file.