Regex Cheat Sheet Online - Search JavaScript Syntax
Search a compact JavaScript regular expression reference for classes, anchors, groups, lookaheads, quantifiers and flags.
About this tool
The built-in memo filters syntax and plain-language descriptions by a case-insensitive query. Leave it empty to view all entries.
How to use
- Enter or select the source data.
- Run the tool locally with the required options.
- Review and copy or download the result.
Features
- Seventeen common syntax entries.
- JavaScript flags and replacement references.
- Instant local keyword filtering.
Common use cases
- Recall a regex token.
- Review JavaScript-specific flags.
- Find group and lookahead syntax.
Common issues and tips
- This is a concise reference rather than a complete regular expression specification.
- It does not test a pattern against input text.
Privacy
Processing runs locally in your browser. Input and generated output are not uploaded to Tools12345.
Frequently asked questions
Can it run a regex?
No, use the Regex Tester.
Can every entry be shown?
Yes, leave search empty.
Which flavor does it describe?
JavaScript regular expressions.