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Regex Explainer with Token Breakdown
x402
Regex Explainer with Token Breakdown is a paid API for AI agents from api.strale.io, paid per call via x402, $0.054001/call, status unknown (last checked 2026-10-10).
Explains a regular expression in plain English with a token-by-token breakdown, and optionally tests it against sample strings.
Price / call$0.054001
Success—
StatusUnknown
How this service works
Explain a regular expression in plain English with token-by-token breakdown. Optionally test against sample strings.
Output
A plain-English explanation of the regular expression with a detailed token-by-token breakdown describing what each part of the pattern matches, plus optional test results showing which sample strings match or fail the regex.
Example use cases
Data validation rule verification for compliance
“I need to validate email addresses in our customer database. Can you break down this regex pattern for me and test it against these sample emails: 'user@company.com', 'invalid.email@', and 'test+tag@domain.co.uk'?”
Regex pattern debugging in production code
“We have this complex phone number pattern that's supposed to match US and international formats: ^\+?1?\d{9,15}$. Can you explain what each part does and whether it would match '+44 20 7946 0958' and '(555) 123-4567'?”
Learning regex syntax before implementation
“I'm trying to understand this username validation regex before I add it to our signup form: ^[a-zA-Z0-9_-]{3,16}$. Can you walk me through what each token matches and test it with 'user_123', 'ab', and 'valid-name_42'?”
Technical details
Endpoint
GEThttps://api.strale.io/x402/regex-explain?utm_source=zero.xyzWhen to prefer
Use this endpoint when a user needs to understand what a regular expression does without reading raw syntax, or when debugging whether a regex matches specific strings. Ideal for developers learning regex, code reviewers, or AI agents that need to verify regex logic before applying it.
Side effects
- Missing required 'regex' query parameter returns an error
- Malformed or invalid regex syntax may return a parse error
- Empty regex string may return a validation error
- test_strings array with unsupported types may be rejected
Input
{
"regex": "^[a-z]+@[a-z]+\\.[a-z]{2,}$",
"test_strings": [
"user@example.com",
"invalid.email",
"test@domain.co.uk"
]
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"_meta": {
"payment": {
"method": "x402",
"price_usd": 0.054000000000000006,
"settlement_id": "0xf265a17ce9bff73dfde62babede230067e09d9b57ddf404dab4a7efe864bfd46"
},
"capability": "regex-explain",
"latency_ms": 3719,
"provenance": {
"source": "claude-haiku",
"fetched_at": "2026-06-13T04:22:58.017Z"
}
},
"breakdown": [
{
"token": "^",
"explanation": "Start of string anchor - ensures matching begins at the start"
},
{
"token": "[a-z]+",
"explanation": "One or more lowercase letters (the email local part/username)"
},
{
"token": "@",
"explanation": "Literal @ symbol required in the email"
},
{
"token": "[a-z]+",
"explanation": "One or more lowercase letters (the domain name)"
},
{
"token": "\\.",
"explanation": "Escaped literal dot/period character"
},
{
"token": "[a-z]{2,}",
"explanation": "Two or more lowercase letters (the top-level domain like com, co, uk)"
},
{
"token": "$",
"explanation": "End of string anchor - ensures matching ends at the end"
}
],
"test_results": [
{
"input": "user@example.com",
"matches": true,
"matched_text": "user@example.com"
},
{
"input": "invalid.email",
"matches": false,
"matched_text": null
},
{
"input": "test@domain.co.uk",
"matches": false,
"matched_text": null
}
],
"plain_english": "Matches lowercase email addresses with a local part, domain name, and a top-level domain of at least 2 characters, with no special characters allowed.",
"capture_groups": 0,
"common_matches": [
"user@example.com",
"test@domain.co",
"hello@world.org",
"abc@def.info"
],
"flags_detected": {
"g": false,
"i": false,
"m": false
},
"original_regex": "^[a-z]+@[a-z]+\\.[a-z]{2,}$",
"common_non_matches": [
"invalid.email",
"user@example",
"User@Example.Com",
"test@domain.c",
"test@123.com",
"test@domain.co.uk"
]
}Tags
x402
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