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

That's how I solved my problem:

bool isNumber(String item){
    return '0123456789'.split('').contains(item);
}

List numbers = ['1','a','2','b','3','c','4','d','5','e','6','f','7','g','8','h','9','i','0'];
print(numbers);
numbers.removeWhere((item) => !isNumber(item));
print(numbers);

And here's the output:

[1, a, 2, b, 3, c, 4, d, 5, e, 6, f, 7, g, 8, h, 9, i, 0]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 0]