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Regex to JavaScript
Turn a regular expression and flags into paste ready JavaScript with a literal form, a constructor and examples.
Write a regex and get JavaScript
Pattern: —
Flags: —
Status: —
How to use the Regex to JavaScript
- Type the regular expression pattern you want to use.
- Pick the flags and paste a sample text to test against.
- Generate the code and copy the form you need.
Features
- Literal and RegExp constructor forms
- test and match examples with your own sample text
- A replace example ready to adapt
- Warns when the pattern does not compile
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Frequently Asked Questions
Common questions about the free online regex to javascript.
Write it as a literal between slashes such as /abc/g, or build it from a string with the
RegExp constructor.
A literal is compiled once when the script loads, while the constructor form can build a
pattern from a variable at runtime.
g finds every match, i ignores letter case, m treats each line as a separate string and s
lets a dot match newlines.
Call the test method, which returns true or false, while the match method returns the matched
text instead.
An unbalanced bracket or a trailing backslash breaks the expression, and the tool tells you
when that happens.
Put a backslash before it, so a literal dot becomes a backslash and a dot in the pattern.
Yes. With g the global matching methods return every match, and a regex object also remembers
its last position.
Yes. Escape the input first, then pass the string to the RegExp constructor so special
characters are treated literally.
Yes. The generator is free, runs locally in your browser and needs no account or sign-up.
Last updated: October 10, 2026