

- Trending Categories
Data Structure
Networking
RDBMS
Operating System
Java
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Regular Expression "d" construct in Java
The subexpression/metacharacter “\d” matches the digits.
Example 1
import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "\\d 24"; String input = "This is sample text 12 24 56 89 24"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }
Output
Number of matches: 2
Example 2
Following is a Java program that reads a 10-digit number from the user.
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Test { public static void main( String args[] ) { String regex = "\\d{10}"; Scanner sc = new Scanner(System.in); System.out.println("Enter your phone number (10 digits): "); String input = sc.nextLine(); //Creating a Pattern object Pattern p = Pattern.compile(regex); //Creating a Matcher object Matcher m = p.matcher(input); if(m.find()) { System.out.println("OK"); } else { System.out.println("Wrong input"); } } }
Output 1
Enter your phone number (10 digits): 9848022338 OK
Output 2
Enter your phone number (10 digits): 545 Wrong input
- Related Questions & Answers
- Regular Expression "\d" construct in Java
- Regular Expression "[^...]" construct in Java
- Regular Expression "\A" construct in Java
- Regular Expression "\z" construct in Java
- Regular Expression "\D" Metacharacter in Java
- Explain the Java regular expression construct "re?".
- How does [\d+] regular expression work in Python?
- Construct the Regular expression for the given languages.
- Construct NFA with Epsilon moves for regular expression a+ba*.
- Regular Expression "[^...]" sub expression in Java
- Regular Expression re+ Metacharacter in Java
- Regular Expression \b Metacharacter in Java
- Regular Expression \t Metacharacter in Java
- Regular Expression \E Metacharacter in Java.
- Regular Expression \Q Metacharacter in Java
- What is regular expression in Java?
Advertisements