description

# indexOf method Null safety

int indexOf (

1. Pattern pattern,
2. [int start = 0]

)

Returns the position of the first match of `pattern` in this string, starting at `start`, inclusive:

    var string = 'Dartisans';
    string.indexOf('art');                     // 1
    string.indexOf(new RegExp(r'[A-Z][a-z]')); // 0

Returns -1 if no match is found:

    string.indexOf(new RegExp(r'dart'));       // -1

`start` must be non-negative and not greater than length.

## Implementation

    int indexOf(Pattern pattern, [int start = 0]);