{
  "name": "regexp_substr",
  "type": "function",
  "groups": ["String"],
  "description": "Returns the portion of a string which matches a supplied regular expression.",
  "arguments": [{
    "arg": "input_string",
    "description": "the string to find matches in"
  }, {
    "arg": "regex",
    "description": "The regular expression to match against. Backslash characters must be double escaped (e.g., \"\\\\\\\\s\" to match a white space character)."
  }],
  "examples": [{
    "expression": "regexp_substr('abc123','(\\\\\\\\d+)')",
    "returns": "'123'"
  }],
  "tags": ["regular", "matches", "supplied", "portion"]
}