QGIS/resources/function_help/json/regexp_match

{
  "name": "regexp_match",
  "type": "function",
  "groups": ["Conditionals", "String"],
  "description": "Return the first matching position matching a regular expression within an unicode string, or 0 if the substring is not found.",
  "arguments": [ {"arg":"input_string","description":"the string to test against the regular expression"},
  {"arg":"regex","description":"The regular expression to test against. Backslash characters must be double escaped (e.g., \"\\\\\\\\s\" to match a white space character or  \"\\\\\\\\b\" to match a word boundary)."}
  ],
  "examples": [ { "expression":"regexp_match('QGIS ROCKS','\\\\\\\\sROCKS')", "returns":"5"}, { "expression":"regexp_match('Budač','udač\\\\\\\\b')", "returns":"2"}]
}