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Regex Generator from Natural Language Prompt
x402
Regex Generator from Natural Language Prompt is a paid API for AI agents from x402-deployer.x402-deployer.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Converts a natural language description into a regex pattern with flags, explanation, and test examples, with live JS execution on sample text
Price / call$0.01
Success—
StatusUnknown
How this service works
Regex generator / NL to regex / pattern builder. PCRE / JavaScript / Python / Go / RE2. Returns pattern + flags + explanation + 3-6 test examples. Live-runs JS regex on sample_text.
Output
Returns a regex pattern string, associated flags, a plain-English explanation of how the pattern works, 3-6 test example strings (showing matches/non-matches), and live JS regex execution results against the provided sample text.
Example use cases
Example prompt
“Generate a JavaScript regex that matches a valid US phone number in formats like (555) 123-4567 or 555-123-4567, and test it against the sample text: 'Call us at (800) 555-1234 or 1-800-555-9876 for support.'”
Technical details
Endpoint
POSThttps://x402-deployer.x402-deployer.workers.dev/regex-from-promptWhen to prefer
Use this endpoint when you need to generate a regex from a plain English description and want an immediate explanation plus test cases — especially useful when targeting a specific flavor (PCRE, JS, Python, Go, RE2) or when you want to validate the pattern against sample text in one call.
Side effects
- Ambiguous prompt leads to incorrect or overly broad pattern
- Requested flavor not supported returns error
- Sample text not provided skips live execution results
- Payment not included or insufficient USDC returns 402
- Very complex multi-condition patterns may produce incomplete regex
Input
{
"input": {
"body": {
"flags": "g",
"flavor": "javascript",
"prompt": "Match all valid email addresses",
"sample_text": "Contact support@example.com or info@test.org for assistance"
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"flags": "g",
"model": "mistral-small-3-2-24b-instruct",
"flavor": "javascript",
"source": "venice",
"caveats": [
"This regex does not cover all possible valid email addresses according to the official specification (RFC 5322).",
"It does not handle internationalized email addresses (those with non-ASCII characters).",
"The regex does not handle quoted local parts (e.g., \"user name\"@example.com)."
],
"pattern": "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$",
"live_error": null,
"explanation": "This regex matches strings that start with one or more alphanumeric characters, dots, underscores, percent signs, plus signs, or hyphens, followed by an @ symbol, then one or more alphanumeric characters, dots, or hyphens, a dot, and finally two or more letters.",
"live_matches": [],
"test_examples": [
{
"input": "user@example.com",
"reason": "Valid email address",
"should_match": true
},
{
"input": "firstname.lastname@example.co.uk",
"reason": "Valid email address with multiple subdomains",
"should_match": true
},
{
"input": "user@sub.domain.com",
"reason": "Valid email address with subdomain",
"should_match": true
},
{
"input": "user@.com",
"reason": "Invalid email address, missing domain",
"should_match": false
},
{
"input": "user@domain",
"reason": "Invalid email address, missing top-level domain",
"should_match": false
},
{
"input": "user@domain..com",
"reason": "Invalid email address, consecutive dots",
"should_match": false
}
],
"sample_text_chars": 59
}Tags
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