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Regex Match & Backtracking Risk Analyzer
x402
Regex Match & Backtracking Risk Analyzer is a paid API for AI agents from sigtap-outreach-api.sigtap.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Runs a regex pattern against input text and returns all matches with capture groups, total match count, and a backtracking-risk heuristic
Price / call$0.001
Success—
StatusUnknown
How this service works
Paid micro-utilities for cold-email outreach agents: domain deliverability audits, cold-email grading, template generation, plus a tools toolbox (hashing, JWT decode, IDs, slugs, JSON, regex, crypto prices, domain age, weather). Paid via x402 (USDC on Base). One signature per call. No keys. FREE CHECK: GET /preview/<paid-path> (same URL with /preview/ prefix) returns a 200 demo sample - verify output shape before paying. PAID CALL: GET the url -> 402 challenge -> sign + retry with X-PAYMENT -> settled on-chain (USDC, Base). Ready-to-paste client: GET /llms.txt section "Pay in one call". Catalog+MCP twin: /llms.txt.
Output
A JSON object containing: the original pattern, total count of matches, an array of match objects each with the matched string, its character index in the input, and any capture groups, plus a backtracking_risk object with a risk level (low/medium/high) and an array of reasons explaining any detected risks.
Example use cases
Extract all dates from log output
“Run the pattern (\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}) against this log blob and give me every match with its index and capture groups: '2024-01-10T08:23:11 ERROR disk full, 2024-01-10T09:01:44 INFO restarted'”
Check regex for ReDoS vulnerability
“I want to use the pattern (a+)+ in my API input validator — before I ship it, can you check how many times it matches against 'aaaaab' and tell me if it has a high backtracking risk?”
Parse key-value pairs from config string
“Use the regex (\w+)=(\S+) to extract all key-value pairs from this config line: 'host=localhost port=5432 dbname=mydb user=admin timeout=30' and show me the groups and total count.”
Technical details
Endpoint
GEThttps://sigtap-outreach-api.sigtap.workers.dev/tools/regexWhen to prefer
Choose this endpoint when you need to both execute a regex match AND get a safety assessment of the pattern's backtracking risk in a single call — particularly useful before deploying regex patterns to production systems where ReDoS attacks are a concern. Prefer this over a plain regex library when you want structured match results with group extraction and a heuristic risk flag without setting up local infrastructure.
Side effects
- Invalid regex pattern syntax returns an error
- Missing required 'input' parameter returns a validation error
- Extremely long input strings may time out on the Cloudflare Worker
- Pattern with no matches returns count 0 and an empty matches array
- Malformed query parameters return 400-level errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 2,
"matches": [
{
"index": 0,
"match": "42",
"groups": []
}
],
"pattern": "\\d+",
"backtracking_risk": {
"risk": "low",
"reasons": []
}
}
}Tags
x402
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