How to Check Special Characters in Java Code

In this Java example we are going to learn How to Check Special Characters in Java Code,

so a special character is a character that is not an alphabetic or numeric character. Punctuation

marks and other symbols are examples of special charecters like @, #, $, %, &. you can simply

use regex class for doing this.especially we are going to use java.util.regex.Matcher and

java.util.regex.Pattern. so Java Matcher class is used to search through a text for multiple

occurrences of a regular expression. You can also use a Matcher to search for the same

regular expression in different texts.

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So now this is the code for How to Check Special Characters in Java Code

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

public class Codeloop {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		String text = "@codeloop#";
		
		Pattern pattern = Pattern.compile("[^A-Za-z0-9]");
	    Matcher matcher = pattern.matcher(text);
	 
	     boolean match = matcher.find();
	     if (match == true)
	        System.out.println("Text contains special charecter :  " +  text);
	     else
	         System.out.println( "Text does not contain special charecter  " + text);
	  

	}

}

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class Codeloop {

public static void main(String[] args) {

// TODO Auto-generated method stub

String text = "@codeloop#";

Pattern pattern = Pattern.compile("[^A-Za-z0-9]");

Matcher matcher = pattern.matcher(text);

boolean match = matcher.find();

if (match == true)

System.out.println("Text contains special charecter : " + text);

else

System.out.println( "Text does not contain special charecter " + text);

}

So you can see that after creating of our java class (Codeloop), we have imported our required

classes from regex. basically we need two imports java.util.regex.Matcher and

java.util.regex.Pattern.

In here we have created our Pattern . and after that we have defined our pattern.

 Pattern pattern = Pattern.compile("[^a-zA-Z0-9]")

1	Pattern pattern = Pattern.compile("[^a-zA-Z0-9]")

And in here we have created our Matcher.

 Matcher matcher = pattern.matcher(text);

1	Matcher matcher = pattern.matcher(text);

Now if you run the code this will be the result.

Text contains special charecter :  @codeloop#

1	Text contains special charecter : @codeloop#

So let’s remove the special character from our text, and this will be the result.

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

public class Codeloop {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		String text = "codeloop";
		
		Pattern pattern = Pattern.compile("[^A-Za-z0-9]");
	    Matcher matcher = pattern.matcher(text);
	 
	     boolean match = matcher.find();
	     if (match == true)
	        System.out.println("Text contains special charecter :  " +  text);
	     else
	         System.out.println( "Text does not contain special charecter  " + text);
	  

	}

}