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API · /regex-api

Regex API

healthy 4,763 Subscribers

Run regular expressions server-side without the ReDoS risk. Test whether a pattern matches, extract all matches with their positions and capture groups (numbered and named), replace with a substitution pattern, or split text — all with the familiar JavaScript regex flags (g, i, m, s, u, y). Every evaluation runs in an isolated sandbox with a hard timeout, so a catastrophic-backtracking pattern can never hang your service; you get a clear timeout error instead. Inputs accept GET query parameters or a JSON POST body. Pure local compute with no third-party upstream, so responses are instant and the service is always available. Ideal for no-code and automation platforms, data-cleaning pipelines, form and input validation, log parsing and content tooling.

#regex #regexp #pattern #match #text #dev-tools
api.oanor.com/regex-api
Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/regex-api/openapi.json
/api/regex-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
104 ms
Server probes · 24h
Subscribers
4,763
active
Total calls
16
last 7 days
status Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,000 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,000 requests/month, 2 req/s
  • Test, match, replace & split
  • Numbered & named capture groups
  • No credit card
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Basic

€4.00 /month

  • 50,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 50,000 requests/month, 8 req/s
  • All JS flags (g i m s u y)
  • ReDoS-safe sandboxed execution
  • Commercial use, email support
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Pro

€13.00 /month

  • 500,000 calls / month
  • 25 requests / second
  • Hard cap (429 above quota, no overage)
  • 500,000 requests/month, 25 req/s
  • High-volume text processing
  • Match positions & groups
  • Priority email support
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Mega

€29.00 /month

  • 3,000,000 calls / month
  • 60 requests / second
  • Hard cap (429 above quota, no overage)
  • 3,000,000 requests/month, 60 req/s
  • Pipeline & automation scale
  • Maximum concurrency
  • Priority support
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Built by

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api.oanor.com/textdiff-api

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Regex API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Regex API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Regex API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Regex API cost?
Regex API has a free tier with 100 calls / month. Paid plans start at €4.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Regex API GDPR-compliant?
All requests to Regex API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/regex-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/regex-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/regex-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/regex-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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