Visual Regex Builder
Assemble a regular expression from structured pieces — literals, character classes, quantifiers, anchors, groups, alternation and backreferences — then test it on sample text.
/^[A-Za-z0-9._%+-]{1,}@[A-Za-z0-9.-]{1,}\.[A-Za-z]{2,6}/g^ — Asserts position ^ — it consumes no characters.
[A-Za-z0-9._%+-] — Matches one character in A-Za-z0-9._%+-.
{1,} — Repeats the previous piece 1 or more times.
@ — Matches the literal text “@”.
[A-Za-z0-9.-] — Matches one character in A-Za-z0-9.-.
{1,} — Repeats the previous piece 1 or more times.
\. — Matches the literal text “.”.
[A-Za-z] — Matches one character in A-Za-z.
{2,6} — Repeats the previous piece between 2 and 6 times.
Import a typed pattern
Contact ada@example.com or grace.hopper@navy.mil — invalid: nope@, @x.io0 matches
Matches & capture groups
No matches yet.
About this tool
Build a regular expression from structured rows and watch the pattern assemble live; you can also paste a pattern and parse it back into rows. Testing runs JavaScript's own engine in your browser, so matches, capture groups and syntax errors are exactly what your code will see. Nothing is uploaded and there is no server involved.
- 100% free — no account needed
- Runs in your browser
- Nothing is uploaded
Frequently asked questions
Is Visual Regex Builder really free?
Yes. Visual Regex Builder is completely free on PureBrowser — every feature, with no account, no trial, and no credit card.
Does Visual Regex Builder upload my data?
No. Visual Regex Builder runs entirely inside your browser, so anything you type, paste, or open stays on your own device.
Do I need to sign up or install anything?
Neither. There is no account and nothing to download — open the page and Visual Regex Builder is ready to use on desktop or mobile.
Does Visual Regex Builder work offline?
Once the page has loaded, yes. All of the processing happens locally in your browser, so it keeps working without a connection.
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