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Agent402 UK Regex Tester
x402
Agent402 UK Regex Tester is a paid API for AI agents from agent402.co.uk, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Tests a JavaScript regex pattern against a text string and returns whether it matched, the match value, and pattern validity
Price / call$0.001
Success—
StatusUnknown
How this service works
Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.
Output
Returns a JSON object with three fields: 'valid' (boolean indicating whether the regex pattern itself is syntactically valid), 'matched' (boolean indicating whether the pattern matched the input text), and 'match' (the matched substring if a match was found).
Example use cases
Validate UK postcode format
“Run the regex ^[A-Z]{1,2}[0-9][0-9A-Z]?\s?[0-9][A-Z]{2}$ against the text 'SW1A 2AA' with the i flag and tell me if it's a valid UK postcode.”
Extract order ID from message
“Test the pattern ORD-[0-9]{6} against the text 'Your order ORD-482910 has shipped' — does it match, and what did it capture?”
Check email format before sending
“Before I trigger the email workflow, can you verify that the pattern ^[\w.-]+@[\w.-]+\.[a-zA-Z]{2,}$ actually matches 'alice.jones@example.co.uk'?”
Technical details
Endpoint
POSThttps://agent402.co.uk/v1/utils/regexWhen to prefer
Choose this endpoint when an AI agent needs a deterministic, safe regex evaluation without risk of hallucinating match results. It is especially useful when the agent must not invent whether a pattern matches — such as input validation gates, data extraction checks, or pre-flight format verification — and when the pattern is a JS-compatible regex.
Side effects
- Invalid regex syntax returns valid:false and no match result
- Empty pattern or text may return matched:false with no error detail
- Unsupported flags (outside gimsuy) may cause the pattern to be rejected
- Network or payment failure returns HTTP 402 or 5xx with no result
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Input text |
| flags | string | Optional flags gimsuy |
| pattern | string | JS regex source |
Output
Schema · Response
{
"type": "json",
"example": {
"match": "GB123",
"valid": true,
"matched": true
}
}Tags
x402
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