1var string = 'dartlang';
2string.substring(1);    // 'artlang'
3string.substring(1, 4); // 'art'

1void main() { 
2   String str1 = "Hello World"; 
3   print("New String: ${str1.substring(6)}"); 
4   
5   // from index 6 to the last index 
6   print("New String: ${str1.substring(2,6)}"); 
7   
8   // from index 2 to the 6th index 
9} 

1// To remove or add anything at the end or to the start of the string

1void main() {
2  const str = "the quick brown fox jumps over the lazy dog";
3  const start = "quick";
4  const end = "over";
5
6  final startIndex = str.indexOf(start);
7  final endIndex = str.indexOf(end, startIndex + start.length);
8
9  print(str.substring(startIndex + start.length, endIndex)); // brown fox jumps
10}