Is there a parser that consumes a string that matches a regex?

[leeflix]

i expected pattern() to do this but it seems to work different

[renggli]

Correct, have a look at the method documentation:

/// Returns a parser that accepts a single character of a given character set
/// provided as a string.
///
/// Characters match themselves. A dash `-` between two characters matches the
/// range of those characters. A caret `^` at the beginning negates the pattern.
///
/// For example, the parser `pattern('aou')` accepts the character 'a', 'o', or
/// 'u', and fails for any other input. The parser `pattern('1-3')` accepts
/// either '1', '2', or '3'; and fails for any other character. The parser
/// `pattern('^aou') accepts any character, but fails for the characters 'a',
/// 'o', or 'u'.
@useResult
Parser<String> pattern(String element, [String? message]) =>
    SingleCharacterParser(_pattern.parse(element).value,
        message ?? '[${toReadableString(element)}] expected');

There is a parser that works on any Pattern such as RegExp, but generally I don't advertise using it: https://github.com/petitparser/dart-petitparser/blob/main/lib/src/parser/predicate/pattern.dart