Flutter Dart: How to extract a number from a string using RegEx

Question

I want to extract a number (integer, decimal or 12:30 formats) from a string. I have used the following RegEx but to no avail:

final RegExp numberExp = new R         


        

Answer 1

For one-line strings you can simply use:

final intValue = int.parse(stringValue.replaceAll(RegExp('[^0-9]'), ''));