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regex

Purpose​

regex extracts the first instance of a regular expression pattern.

Validate regex patterns at https://regex101.com using the Golang flavor.

Usage​

"type": "regex",
"config": {
    "pattern": "<regular expression>"
    "captureGroup": "<int>"
}
KeyDescription
patternRegular expression pattern to match against.
captureGroup(optional) Capture group to use when capture groups are defined. Capture groups start at 1. By default capture groups may be used but no one group will be selected.

Example​

Before and After Example​

Configuration​

{
   "type": "regex",
   "config": {
       "pattern": "\\d{4}(-\\d{2}){0,2}$"
   }
}

Example Chains​

req_body() -> json_path(path="filter") -> regex(pattern="\\d{4}(-\\d{2}){0,2}$")

This will extract the filter field from the request body and extract the date pattern from it.

http_req_header(header="User-Agent") -> regex(pattern="Chrome/([0-9.]+)", captureGroup=1)

This will extract the Chrome version number from the User-Agent header.

res_body() -> json_path(path="url") -> regex(pattern="location/(.*)/info", captureGroup=1)

This will extract the location name from a URL path in the response body.

Before (Original Values)​

  • Filter String: filter=(contains(subject, 'order') and ReceivedDateTime ge 2021-04-19
  • User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36
  • URL Path: /location/Miami/info
  • Email Pattern: Contact us at support@example.com for help

After (Regex Extracted)​

  • Filter String (date extracted): 2021-04-19
  • User-Agent (Chrome version): 91.0.4472.124
  • URL Path (location name): Miami
  • Email Pattern (email extracted): support@example.com