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JavaScript Regex Tester
x402
JavaScript Regex Tester is a paid API for AI agents from dev-utils.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-02).
Runs a JavaScript regex pattern against text and returns all matches, capture groups, and character indexes, with catastrophic-backtracking protection.
Price / call$0.02
Success—
StatusUnknown
How this service works
Run a JS regex on text: matches, groups, indexes. Capped input and a time budget stops catastrophic backtracking.
Output
Returns a list of match objects each containing the matched string, start index, end index, positional capture groups, and named capture groups. Also returns match count, flags used, execution time in ms, and boolean flags for timeout, truncation, and degraded mode if input was too large or the regex ran too long.
Example use cases
Extract dates from log file
“I have a big log string and I want to pull out every date in YYYY-MM-DD format. Use the pattern `(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})` with the global flag on this text: 'Error on 2024-01-10, resolved 2024-01-11, reopened 2024-03-22.'”
Validate email pattern matching
“Test whether the regex `[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}` with the global flag finds all email addresses in this text: 'Contact us at support@example.com or sales@company.org for help.'”
Parse structured data from messy text
“Run the regex `(\w+):\s*(\d+)` globally on this text: 'apples: 4, oranges: 12, bananas: 7' and give me all the matched key-value pairs with their capture groups.”
Technical details
Endpoint
GEThttps://dev-utils.x402tookit.com/regex-test?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need server-side JavaScript regex execution with safety guarantees against catastrophic backtracking, especially when the regex or input text is user-supplied and could cause a ReDoS attack in a local environment. Prefer this over running regex locally when you need a sandboxed, time-budgeted execution environment or when you need detailed match metadata including indexes and named groups.
Side effects
- Regex times out due to catastrophic backtracking — timedOut flag is set to true and partial results may be returned
- Input text exceeds 20000 characters — text is truncated and truncated flag is set
- Regex pattern exceeds 500 characters — request rejected
- Invalid regex syntax — error response returned
- Invalid flags provided — request rejected or flags ignored
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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