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Matching Nonprintable Characters using Java regex
There are 7 common non printable characters used in general and each character has its own hexadecimal representation.
Name | characters | Hexa-decimal representation |
---|---|---|
bell | \a | 0x07 |
Escape | \e | 0x1B |
Form feed | \f | 0x0C |
Line feed | \n | 0x0A |
Carriage return | \r | 0X0D |
Horizontal tab | \t | 0X09 |
Vertical tab | \v | 0X0B |
Example 1
Following Java program accepts an input text and counts the number of tab spaces in it −
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample1 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter input text: "); String input = sc.nextLine(); String regex = "\t"; //Creating a pattern object Pattern pattern = Pattern.compile(regex); //Matching the compiled pattern in the String Matcher matcher = pattern.matcher(input); int count =0; while (matcher.find()) { count++; } System.out.println("Number of tab spaces in the given iput text: "+count); } }
Output
sample text with tab spaces Number of tab spaces in the given input text: 3
Example 2
You can also use the respective hexa-decimal representations of the non-printable characters to match.
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample1 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter input text: "); String input = sc.nextLine(); String regex = "\x09"; //Creating a pattern object Pattern pattern = Pattern.compile(regex); //Matching the compiled pattern in the String Matcher matcher = pattern.matcher(input); int count =0; while (matcher.find()) { count++; } System.out.println("Number of tab spaces in the given iput text: "+count); } }
Output
Enter input text: sample data with tab spaces Number of tab spaces in the given input text: 4
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