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Regex Replace (RE2)
x402
Regex Replace (RE2) is a paid API for AI agents from regex.openverbs.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).
Replaces all or first occurrences of a RE2 regex pattern in a string with a replacement that may reference capture groups.
Price / call$0.004
Success—
StatusUnknown
How this service works
Replace matches of a RE2 pattern with a replacement string. Replaces all matches by default (set all=false for first-only). The replacement may reference capture groups with $1, $2 or ${name}. Returns the resulting string.
Output
Returns a JSON object containing the resulting string after all specified regex replacements have been applied. The output reflects the modified text with every matched occurrence (or just the first, if all=false) substituted with the replacement string, which may include capture group back-references.
Example use cases
Redact PII from log lines
“Take this server log text and replace every email address matching the pattern '[\w.+-]+@[\w-]+\.[\w.]+' with '[REDACTED]', replacing all matches.”
Reformat dates in a document
“I have a long document where dates are written as MM/DD/YYYY — can you replace them all with YYYY-MM-DD format using a regex capture group substitution? The pattern would be '(\d{2})/(\d{2})/(\d{4})' and replacement '$3-$1-$2'.”
Normalize whitespace in user input
“Clean up this user-submitted text by replacing all runs of two or more whitespace characters with a single space, replacing every match.”
Technical details
Endpoint
POSThttps://regex.openverbs.com/v1/replaceWhen to prefer
Use this endpoint when you need deterministic, linear-time regex replacement guaranteed by the RE2 engine (safe against ReDoS). Prefer it over client-side regex when running in a sandboxed or serverless environment without regex libraries, or when you need a simple API-callable string transform without spinning up compute. The RE2 constraint means avoid it if you need PCRE features like lookaheads or backreferences in the pattern itself.
Side effects
- Invalid RE2 pattern syntax returns an error (RE2 does not support lookaheads, backreferences, etc.)
- Input text exceeding 1,000,000 characters is rejected
- Pattern string exceeding 4,096 characters is rejected
- Invalid flag characters in flags field cause an error
- Payment failure or insufficient balance returns 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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