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Vextorium Regex Test API
x402
Vextorium Regex Test API is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-19).
Tests a regular expression against text, returning all matches with positions, capture groups, named groups, and optional substitution result
Price / call$0.002
Success—
StatusUnknown
How this service works
Test a regular expression against a text: every match with position, groups and named groups, plus the result of a substitution if you pass a replacement. Flags i, m, s, x. Time-limited, safe against catastrophic backtracking.
Output
A JSON object containing: whether any matches were found (matches bool), total match count (num_matches), list of match objects each with start/end character positions, matched text, ordered capture groups array, named capture groups object, plus the group_names list and substitution_result string if a replacement was provided.
Example use cases
Email extraction from free text
“Run the pattern (?P<user>[\w.+-]+)@(?P<domain>[\w-]+\.[\w.]+) against this text: 'Reach out to sales@company.com or support@help.io' — I want every match with the user and domain named groups shown separately.”
Regex substitution preview
“Test the pattern (\d{3})-(\d{4}) on the string 'Call 555-1234 or 555-9876' with the replacement ***-\2, and show me what the substituted string looks like along with all matches.”
Multiline pattern validation
“Check whether the pattern ^ERROR:\s+(.+)$ with the m and i flags matches anything in this log: 'INFO: started\nError: disk full\nDEBUG: ok' and list every matched line with capture group text.”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/regex-test?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need server-side regex execution with guaranteed safety against ReDoS (catastrophic backtracking), especially when running untrusted or complex patterns. It is preferable over client-side regex when you need structured output (positions, named groups, substitution result) in a single API call, or when the agent environment does not support native regex execution.
Side effects
- Pattern causes catastrophic backtracking — endpoint enforces a time limit and returns a timeout/error
- Invalid regex syntax in pattern field — returns an error describing the syntax problem
- Missing required fields (pattern or text) — returns a validation error
- Unsupported flag character supplied — returns an error listing valid flags (i, m, s, x)
- Empty text or pattern — may return matches:false with num_matches:0
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | |
| flags | string | |
| pattern | string | |
| max_matches | integer | |
| replacement | string |
Output
Schema · Response
{
"type": "json",
"example": {
"flags": null,
"matches": [
{
"end": 9,
"text": "ana@x.com",
"start": 0,
"groups": [
"ana",
"x.com"
],
"named_groups": {
"dom": "x.com",
"user": "ana"
}
},
{
"end": 22,
"text": "luis@y.org",
"start": 12,
"groups": [
"luis",
"y.org"
],
"named_groups": {
"dom": "y.org",
"user": "luis"
}
}
],
"pattern": "(?P<user>\\w+)@(?P<dom>[\\w.]+)",
"is_match": true,
"group_names": [
"user",
"dom"
],
"num_matches": 2,
"defined_groups": 2,
"substitution_result": null
}
}Tags
x402
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