QGIS/resources/function_help/json/LIKE

{
  "name": "LIKE",
  "type": "operator",
  "description": "Returns 1 if the first parameter matches the supplied pattern. Works with numbers also.",
  "arguments": [
    {"arg":"string/number","description":"value"},
    {"arg":"pattern","description":"pattern to compare value with, you can use '%' as a wildcard, '_' as a single char and '\\\\' to escape."}
  ],
  "examples": [
    { "expression":"'A' LIKE 'A'", "returns":"1"},
    { "expression":"'A' LIKE 'a'", "returns":"0"},
    { "expression":"'A' LIKE 'B'", "returns":"0"},
    { "expression":"'ABC' LIKE 'B'", "returns":"0"},
    { "expression":"'ABC' LIKE '_B_'", "returns":"1"},
    { "expression":"'ABCD' LIKE '_B_'", "returns":"0"},
    { "expression":"'ABCD' LIKE '_B%'", "returns":"1"},
    { "expression":"'ABCD' LIKE '%B%'", "returns":"1"},
    { "expression":"'1%' LIKE '1\\\\%'", "returns":"1"},
    { "expression":"'1_' LIKE '1\\\\%'", "returns":"0"}
  ]
}