extract method

Expr extract(
  1. Object pattern, {
  2. int groupIndex = 1,
})

Implementation

Expr extract(Object pattern, {int groupIndex = 1}) {
  if (groupIndex < 0) throw RangeError.value(groupIndex, 'groupIndex');
  return _expr._function(
    'str.extract',
    arguments: [pattern],
    options: {'groupIndex': groupIndex},
  );
}