QGIS/resources/function_help/json/regexp_matches

{
  "name": "regexp_matches",
  "type": "function",
  "description": "Returns an array of all strings captured by capturing groups, in the order the groups themselves appear in the supplied regular expression against a string.",
  "arguments": [
    {"arg":"string", "description":"the string to capture groups from against the regular expression"},
    {"arg":"regex","description":"the regular expression used to capture groups"},
    {"arg":"empty_value","optional":true,"default":"''","description":"the optional string to use as replacement for empty (zero length) matches"}],
  "examples": [ { "expression":"regexp_matches('QGIS=>rocks','(.*)=>(.*)')", "returns":"array: 'QGIS', 'rocks'"},
                { "expression":"regexp_matches('key=>','(.*)=>(.*)','empty value')", "returns":"array: 'key', 'empty value'"}
  ]
}