How do you remove all the alphabetic characters from a string?

Question

I have a string containg alphabetic characters, for example:

1. 254.69 meters
2. 26.56 cm
3. 23.36 inches

Answer 1

Hi another solution is:

// add directive at the top 
using System.Text.RegularExpressions;
string s = "24,99";
string numberOnly = Regex.Replace(s, "[^0-9,-]+", "")

This solution will not remove the dot e.g. question from user1804084:

this remove the dot for me e.g. 24.99 somechracter -> 2499

However it can still be convertet to a double where adding and subtraction works as normal.