description

# matchAsPrefix abstract method

Match? matchAsPrefix(

1. String string, [
2. int start = 0

])

Matches this pattern against the start of `string`.

Returns a match if the pattern matches a substring of `string` starting at `start`, and `null` if the pattern doesn't match at that point.

The `start` must be non-negative and no greater than `string.length`.

    final string = 'Dash is a bird';

    var regExp = RegExp(r'bird');
    var match = regExp.matchAsPrefix(string, 10); // Match found.

    regExp = RegExp(r'bird');
    match = regExp.matchAsPrefix(string); // null

## Implementation

    Match? matchAsPrefix(String string, [int start = 0]);