Question

How to extract only numbers from a string in Java

Answer 1

public class MyClass {
    static String extract_only_numbers(String s) { 
        int len = s.length(); 
        String regx = "[0-9]"; 
        String numbers = "";
          
        for (int i = 0; i < len; i++) { 
            char ch = s.charAt(i); 
            if (String.valueOf(ch).matches(regx))  
               numbers = numbers + ch; 
        } 
        return numbers; 
    } 
    public static void main(String args[]) {
        String s = "c++14$vb.net&%java*() php <>/python 3.7.3"; 
          
        System.out.println(extract_only_numbers(s)); 
    }
}
  
  
  
/*
run:
  
14373
  
*/

 

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