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Regex syntax reference with examples. Anchors, quantifiers, groups, lookaheads, character classes, and more.
Enter a pattern to see token explanations.
.Any character except newline
\dDigit
\wWord character
\sWhitespace
[^abc]Not a, b, or c
*0 or more
+1 or more
?0 or 1
{n,m}Range repetition
(group)Capturing group
(?:group)Non-capturing group
(?<name>group)Named group
(?=x) / (?!x)Lookaheads
(?<=x) / (?<!x)Lookbehinds
Quick reference for regex syntax: anchors, quantifiers, character classes, groups, lookaheads, and flags. Covers the most-used constructs with examples.
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Your inputs stay local for standard flows. Processing happens in-browser instead of remote upload pipelines.
Practically speaking, anyone handling practical pattern engineering who needs fast on-device execution without heavyweight local installs. That makes the result easier to verify before publishing.
In day-to-day use, yes, though larger files and advanced operations generally perform better on desktop hardware with more memory. This is usually the most reliable approach for repeatable results.
In most workflows, no account is required for core workflows. You can start immediately and process directly right here.
Check out our technical guides to learn more about how browser-side processing works.
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