Build reliable patterns faster

Regular expressions power URL rewrites, sitemap filters, log scrapers, and form validators. This tester highlights every match with offsets so you can prove a pattern works before dropping it into Nginx rules or Google Search Console filters. Toggle the i/m/s flags to emulate production settings and capture tricky edge cases early.

Suggested workflow

1. Paste real-world sample text—crawl logs, user input, or analytics URLs.
2. Iterate on the regex until the Matches panel returns exactly what you expect.
3. Copy the JSON result to share with engineers or document the rule for content teams.

Need to debug structured data or meta tags? Combine this tester with the HTML formatter to isolate the exact fields you want.