Question

How to move all special characters to the beginning of a string in Java

Answer 1

public class MoveSpecialChars {
    static String move_special_characters_to_beginning(String s) { 
        int len = s.length(); 
        String regx = "[a-zA-Z0-9\\s+]"; 
        String chars = "", pecial_characters = ""; 
          
        for (int i = 0; i < len; i++) { 
            char ch = s.charAt(i); 
            if (String.valueOf(ch).matches(regx))  
               chars = chars + ch; 
            else
               pecial_characters = pecial_characters + ch; 
        } 
        return pecial_characters + chars; 
    } 
    public static void main(String args[]) {
        String s = "c++14$vb.net&%java*() php <>/python 3.7.3"; 
          
        System.out.println(move_special_characters_to_beginning(s)); 
    }
}
  
  
  
/*
run:
  
$.&%*()<>/..c++14vbnetjava php python 373
  
*/

 

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Answer 2

public class MoveSpecialChars {
    public static String moveSpecialCharactersToBeginning(String s) {
        StringBuilder specials = new StringBuilder();
        StringBuilder chars = new StringBuilder();

        for (char ch : s.toCharArray()) {
            if (Character.isLetterOrDigit(ch) || Character.isWhitespace(ch)) {
                chars.append(ch);
            } else {
                specials.append(ch);
            }
        }

        return specials.toString() + chars.toString();
    }

    public static void main(String[] args) {
        String s = "c++20$c&^java*(rust) php <>/python 3.14.2";
        
        System.out.println(moveSpecialCharactersToBeginning(s));
    }
}



/*
run:

++$&^*()<>/..c20cjavarust php python 3142

*/

 

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