Syntax error Moving all Upper case letters to the end of the String using Java RegEx

Moving all Upper case letters to the end of the String using Java RegEx

The subexpression “[ ]” matches all the characters specified in the braces. Therefore, to move all the upper case letters to the end of a string −

  • Iterate through all the characters in the given string.

  • Match all the upper case letters in the given string using the regular expression "[A-Z]".

  • Concatenate the special characters and the remaining characters to two different strings.

  • Finally, concatenate the special characters string to the other string.

Example 1

public class RemovingSpecialCharacters {
   public static void main(String args[]) {
      String input = "sample B text C with G upper case LM characters in between";
      String regex = "[A-Z]";
      String specialChars = "";
      String inputData = "";
      for(int i=0; i< input.length(); i++) {
         char ch = input.charAt(i);
         if(String.valueOf(ch).matches(regex)) {
            specialChars = specialChars + ch;
         } else {
            inputData = inputData + ch;
         }
      }
      System.out.println("Result: "+inputData+specialChars);
   }
}

Output

Result: sample text with upper case characters in betweenBCGLM

Example 2

Following is the Java program which moves the upper case letters of a string to its end using the methods of Regex package.

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Test {
   public static void main(String args[]) {
      String input = "sample B text C with G upper case LM characters in between";
      String regex = "[A-Z]";
      String specialChars = "";
      System.out.println("Input string: \n"+input);
      //Creating a pattern object
      Pattern pattern = Pattern.compile(regex);
      //Matching the compiled pattern in the String
      Matcher matcher = pattern.matcher(input);
      //Creating an empty string buffer
      StringBuffer sb = new StringBuffer();
      while (matcher.find()) {
         specialChars = specialChars+matcher.group();
         matcher.appendReplacement(sb, "");
      }
      matcher.appendTail(sb);
      System.out.println("Result: \n"+ sb.toString()+specialChars );
   }
}

Output

Input string:
sample B text C with G upper case LM characters in between
Result:
sample text with upper case characters in betweenBCGLM
Updated on: 2019-11-21T07:29:15+05:30

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