how to convert a string with letters to int c#

Question

this is my question:

Input: s = "4193 with words" Output: 4193

I tryed it this way but it does not work

        int a;
         bool  tf =  int.TryParse(s,out a);
        if(tf == true)
        {
            return a;
        }
        return 0;

So you basically want to ignore all non-digits? Would input like "I say 12" yield 12? What about "12xx34"? — Klaus Gütter, Apr 14 '22 at 11:22
So you have a 2-Step Problem: 1. Strip input string of all non-digit chars. 2. Parse result from 1.) to `int` type. Part 2. you already solved, ... so, we are left with 1. — Fildor, Apr 14 '22 at 11:26
Please check that link. I think you can your problem this way. https://stackoverflow.com/a/7411472/13798699 — Recep Enes Çevlik, Apr 14 '22 at 11:29

score 3 · Accepted Answer · answered Apr 14 '22 at 11:26

You can use this to extract only the numeric characters from the string:

string numStr = new String(s.Where(Char.IsDigit).ToArray());

Then use your existing code, but referring to numStr:

int a;
bool  tf =  int.TryParse(numStr,out a);
if (tf == true)
{
   return a;
}
return 0;

Note that if you'd like to support negative integers, you will need to adapt the first part (extracting relevant characters) accordingly.

score 0 · Answer 2 · answered Apr 14 '22 at 11:22

0

i think you search something like this?

        string input = "1234 words";
        var outputnumber = Convert.ToInt32(Regex.Match(input, @"\d+").Value);

answered Apr 14 '22 at 11:22

Martin Bartolomé

2 Answers2