Test a regex against one or many inputs, safely
Test a regex against one or many inputs, safely. Send {pattern, flags?, input|inputs[], mode?}: 'match' returns the first match + capture groups, 'matchAll' every match, 'replace' the rewritten string (needs {replacement}). A mandatory ReDoS guard statically rejects catastrophic patterns (nested quantifiers, `.*.*$`, backrefs) BEFORE running — on Workers no timeout can stop a runaway regex. For agents that generate and dry-run regexes.
1000 (raw units)
price
1
calls / 30d
1
unique payers
2026-08-24
updated
Provider
402utils.com · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0xc55A2D530b53CBaD1001e4AfD4720B7E71f9C291",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "1000",
"maxTimeoutSeconds": 60
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"body": {
"input": "date: 2026-07-06",
"mode": "match",
"pattern": "(\\d{4})-(\\d{2})-(\\d{2})"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"mode": "match",
"results": [
{
"groups": [
"2026",
"07",
"06"
],
"index": 6,
"match": "2026-07-06",
"matched": true
}
]
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"flags": {
"description": "Any of gimsuyd (g added automatically for matchAll).",
"type": "string"
},
"input": {
"description": "A single input string (≤ 10000 chars).",
"type": "string"
},
"inputs": {
"description": "Multiple input strings.",
"items": {
"type": "string"
},
"maxItems": 50,
"type": "array"
},
"mode": {
"default": "match",
"description": "match | matchAll | replace.",
"enum": [
"match",
"matchAll",
"replace"
],
"type": "string"
},
"pattern": {
"description": "The regular expression source (no delimiters).",
"type": "string"
},
"replacement": {
"description": "Replacement string (with $1, $<name>) — required for mode 'replace'.",
"type": "string"
}
},
"required": [
"pattern"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"mode": {
"enum": [
"match",
"matchAll",
"replace"
],
"type": "string"
},
"results": {
"description": "One entry per input (in order). Shape depends on mode.",
"items": {
"type": "object"
},
"type": "array"
}
},
"required": [
"mode",
"results"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
curl
curl "https://402utils.com/v1/regex-test" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://402utils.com/v1/regex-test");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://402utils.com/v1/regex-test")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/5908.json, and this resource appears in /discovery/resources and /discovery/search.