matchAsPrefix method

  1. @override
Match? matchAsPrefix(
  1. String input, [
  2. int start = 0
])
inherited

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

@override
Match? matchAsPrefix(String input, [int start = 0]) =>
    tryMatch(input.substring(start))
        ? RegexpMatch(this, input, start, input.length)
        : null;