How to check string contains special characters in Java

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In this Java program we will learn how to check the string contains special characters in java using regex .
Regular expressions provides one of the simplest ways to find whether string contains special characters.

 

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Java Program to check string contains special characters in Java

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import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class FindSpecialCharacter

{ 

public int getSpecialCharacter(String str)
 {
     if (str == null || str.trim().isEmpty()) {
         System.out.println("format of string is Incorrect ");
         return 0;
     }
   
     Pattern pattern = Pattern.compile("[^A-Za-z0-9]");
     Matcher matcher = pattern.matcher(str);
 
     boolean b = matcher.find();
     if (b == true)
        System.out.println("There is a special character in my string:- " +  str);
     else
         System.out.println( "There is no special character in my String :-  " + str);
     return 0;
 }

 public static void main(String[] args)
  
  {
    FindSpecialCharacter FSC =new  Main();
    String str ="Tutorialspoint4all.com";
    FSC.getSpecialCharacter(str);
}

}

After execution of above program you will get the output like below:-

 

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