Runs 100% in your browser. Your files never leave this device.
How it works
- JavaScript flavour regex with flags, explained token by token in plain English: classes, quantifiers, groups, anchors and escapes.
- Bulk mode applies the pattern to every line of a pasted log or CSV column and shows per-line pass or fail with the first match.
- Named groups are collected into a table you can export as CSV.
- A small pattern library covers email, SKU, invoice number, log timestamp, USD amount and IPv4.
- Exports a matched and unmatched results CSV so you can see exactly which row 4,812 failed, and why.