Question

How to remove all special characters from a string in Java

Answer 1

public class MyClass {
    public static void main(String args[]) {
        String s = "java#@php!c`-(python)%&.swift";   
        
        s = s.replaceAll("[^a-zA-Z0-9]", " ");  
        
        System.out.println(s);  
    }
}



/*
run:

java  php c   python    swift

*/

 

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Answer 2

public class MyClass {
    public static void main(String args[]) {
        String s = "java#@php!c`-(python)%&.swift";  
        String result = "";  
        int len = s.length();
        
        s = s.replaceAll("[^a-zA-Z0-9]", " ");  
        
        for (int i = 0; i < len; i++) {  
            if (s.charAt(i) > 64 && s.charAt(i) <= 122) {  
                result = result + s.charAt(i);  
            } else {
                if (result.charAt(result.length() - 1) !=  ' ') result = result + " ";  
            } 
        }
        System.out.println(result);  
    }
}



/*
run:

java php c python swift

*/

 

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