Replaces the substring from start to end with replacement.
Returns a new string equivalent to:
this.substring(0, start) + replacement + this.substring(end)
The start and end indices must specify a valid range of this string. That is 0 <= start <= end <= this.length. If end is null, it defaults to length.
String replaceRange(int start, int end, String replacement);
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-core/String/replaceRange.html