QGIS/resources/function_help/json/replace

{
  "name": "replace",
  "type": "function",
  "description": "Returns a string with the supplied string or array of strings replaced by a string or an array of strings.",
  "arguments": [ {"arg":"string","description":"the input string"},
                 {"arg":"before","description":"the string or array of strings to replace"},
                 {"arg":"after","description":"the string or array of strings to use as a replacement"}],
  "examples": [ { "expression":"replace('QGIS SHOULD ROCK','SHOULD','DOES')", "returns":"'QGIS DOES ROCK'"},
                { "expression":"replace('QGIS ABC',array('A','B','C'),array('X','Y','Z'))", "returns":"'QGIS XYZ'"},
                { "expression":"replace('QGIS',array('Q','S'),'')", "returns":"'GI'"}
  ]
}