[Proposal] Please add scanUntil and scanUntilAny

[jolleekin]

Please consider adding these methods

  /// Scans until [delimiter] matches [string] at the current position.
  ///
  /// Returns `true` if something is consumed, `false` otherwise.
  bool scanUntil(Pattern delimiter) {
    final oldPosition = position;
    while (!isDone && !matches(delimiter)) readChar();
    return oldPosition < position;
  }

  /// Scans until any of [delimiters] matches [string] at the current position.
  ///
  /// Returns `true` if something is consumed, `false` otherwise.
  scanUntilAny(List<Pattern> delimiters) {
    final oldPosition = position;
    while (!isDone && !delimiters.any(matches)) readChar();
    return oldPosition < position;
  }

[Ttamez68A]

Please consider adding these methods

  /// Scans until [delimiter] matches [string] at the current position.
  ///
  /// Returns `true` if something is consumed, `false` otherwise.
  bool scanUntil(Pattern delimiter) {
    final oldPosition = position;
    while (!isDone && !matches(delimiter)) readChar();
    return oldPosition < position;
  }

  /// Scans until any of [delimiters] matches [string] at the current position.
  ///
  /// Returns `true` if something is consumed, `false` otherwise.
  scanUntilAny(List<Pattern> delimiters) {
    final oldPosition = position;
    while (!isDone && !delimiters.any(matches)) readChar();
    return oldPosition < position;
  }

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