indexOf abstract method

int indexOf(Pattern pattern, [ int start ])

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.

Source

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

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https://api.dartlang.org/stable/1.24.3/dart-core/String/indexOf.html