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Pattern toString() method in Java with examples
The Pattern class of the java.util.regex package is a compiled representation of a regular expression.
The toString() method of this class returns the string representation of the regular expression using which the current Pattern was compiled.
Example1
import java.util.Scanner; import java.util.regex.Pattern; public class Example { public static void main( String args[] ) { //Reading string value Scanner sc = new Scanner(System.in); System.out.println("Enter input string"); String input = sc.nextLine(); //Regular expression to find digits String regex = "(\d)"; //Compiling the regular expression Pattern pattern = Pattern.compile(regex); //Printing the regular expression System.out.println("Compiled regular expression: "+pattern.toString()); //Verifying whether match occurred if(pattern.matcher(input).find()) System.out.println("Given String contains digits"); else System.out.println("Given String does not contain digits"); } }
Output
Enter input string This 7est contain5 di9its in place of certain charac7er5 Compiled regular expression: (\d) Given String contains digits
Example 2
import java.util.regex.Pattern; public class Example { public static void main(String args[]) { String regex = "Tutorialspoint$"; String input = "Hi how are you welcome to Tutorialspoint"; Pattern pattern = Pattern.compile(regex); Matcher match = pattern.matcher(input); int count = 0; if(match.find()) System.out.println("Match found"); else System.out.println("Match not found"); System.out.println("regular expression: "+pattern.toString()); } }
Output
Match found regular expression: Tutorialspoint$
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