Regex Generator From Sample
Generate a regular expression from a sample string automatically.
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What is a regex generator?
A regex generator builds a regular expression from a sample you paste, turning letters into [a-z] or [A-Z] classes, digits into \d and repeats into counts, so AB-1234 becomes [A-Z]{2}-\d{4}. Snabbit can anchor or wrap the result and runs in your browser, giving you a private head start on a pattern.
How to use the Regex Generator
- 1 Paste a sample string that represents the format you want to match.
- 2 A regular expression for that shape is generated instantly.
- 3 Toggle anchors or the /pattern/g wrapper to suit your code.
- 4 Copy the regex and refine it as needed.
What you can use it for
- Getting a first draft pattern for a known format.
- Learning how a string maps to character classes.
- Speeding up writing a validation regex.
- Producing a pattern for codes like SKUs or refs.
Frequently asked questions
How does it turn a sample into a pattern?
It replaces each run of similar characters with a class — lowercase letters become [a-z], uppercase [A-Z], digits \d — and adds a {n} count for repeats, escaping any other characters literally.
Is the generated regex final?
Treat it as a strong starting point. Real data often varies, so you may want to loosen counts or widen classes; test it with the regex tester afterwards.
What do the anchor and wrapper options do?
Anchoring adds ^ and $ so the pattern must match the whole string, and the wrapper outputs /pattern/g literal syntax for pasting straight into JavaScript.
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