Terms
Last updated 12 November 2026
Short, because the tool is short: you bring a pattern and a text, you take matches back.
Your input stays yours
The pattern, the text and the replacement belong to you. We claim no licence, no ownership and no right to reuse them. Since they never reach us, there would be nothing to claim anyway.
Check the result before you rely on it
A tester shows what one engine does with one sample. A pattern that fits this text may fail on another, and JavaScript and Python disagree about some constructs. Read the match table before you put the pattern into production.
No security guarantee
A regular expression is not a validator for a legal identifier. Phone numbers, business numbers and resident numbers have check digits and rules that a pattern cannot confirm. Use the tool to find and format, not to certify.
Service as it is
The tool is free and provided as it is, without a service level. We may change it, move it or stop it. Because everything runs in your browser, an outage never takes your pattern with it, and nothing you already copied stops working.
Fair use
Use it for as many patterns as you like, including paid work. Do not use it to build something unlawful or to misrepresent who produced a text.
Liability
To the extent the law allows, we are not liable for indirect loss or lost profit arising from use of the tool. Nothing here limits liability that cannot be limited by law.
Changes to these terms
If these terms change, the date at the top changes. Continuing to use the site after that means the new version applies.