QGIS/resources/function_help/json/op_regex

{
  "name": "~",
  "type": "operator",
  "groups": ["Operators"],
  "description": "Performs a regular expression match on a string value. Backslash characters must be double escaped (e.g., \"\\\\\\\\s\" to match a white space character).",
  "arguments": [{
    "arg": "string",
    "description": "A string value"
  }, {
    "arg": "regex",
    "description": "A regular expression. Slashes must be escaped, eg \\\\\\\\d."
  }],
  "examples": [{
    "expression": "'hello' ~ 'll'",
    "returns": "TRUE"
  }, {
    "expression": "'hello' ~ '^ll'",
    "returns": "FALSE"
  }, {
    "expression": "'hello' ~ 'llo$'",
    "returns": "TRUE"
  }, {
    "expression": "'abc123' ~ '\\\\\\\\d+'",
    "returns": "TRUE"
  }],
  "tags": ["white", "space", "regular", "performs", "backslash", "characters", "escaped", "character", "expression", "match"]
}