extractNumbers method
Extracts all numbers (int and double) from this string.
'\$12.5 off, save 3 items'.extractNumbers() // [12.5, 3]
Implementation
List<num> extractNumbers() {
final matches = RegExp(r'-?\d+\.?\d*').allMatches(this);
return matches.map((m) => num.parse(m[0]!)).toList();
}