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Regex Tester API
x402
Regex Tester API is a paid API for AI agents from regex-generator.api.klymax402.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Tests a regular expression pattern against one or more input strings and returns match results
Price / call$0.003
Success—
StatusUnknown
How this service works
Test a regex pattern against input strings
Output
Returns which of the provided test strings match the given regex pattern, along with any captured groups or match details, evaluated under the specified flags (g, i, m, s, u).
Example use cases
Validate phone numbers across regions
“I need to check if these phone numbers follow a valid pattern: '555-123-4567', '(555) 123-4567', '+1-555-123-4567', and '555 123 4567'. Test them against a regex that captures the area code and line number separately, and let me know which ones are valid.”
Check username format compliance
“Can you test these usernames against a pattern that requires 3-16 characters, starting with a letter, and containing only letters, numbers, and underscores? Try: 'john_doe', '2invalid', '_nostart', 'ValidUser123', and 'x'. Tell me which ones pass.”
Extract domain names from URLs
“I have a list of URLs and need to verify they match a proper domain pattern while capturing the domain name separately. Test these against a regex: 'https://github.com', 'www.example.co.uk', 'invalid-url', 'ftp://files.org', and 'mysite.com'. Show me which ones match and what domains you extract.”
Technical details
Endpoint
GEThttps://regex-generator.api.klymax402.com/api/testWhen to prefer
Use this endpoint when you need a quick, server-side regex test against multiple strings without running code locally — ideal for agents validating user input formats, debugging regex patterns, or checking whether a list of strings conforms to a pattern rule.
Side effects
- Invalid regex pattern syntax returns an error
- Missing required 'pattern' or 'testStrings' fields causes a 400-level error
- Unsupported flag characters may be rejected
- Empty testStrings array may return empty results without error
- Very complex or catastrophically backtracking patterns may time out
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| flags | string | Regex flags: g, i, m, s, u (default: g) |
| pattern | string | Regular expression pattern (without delimiters) |
| testStrings | array | Array of strings to test against the pattern |
Tags
x402
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