Using custom character classes - Java Regular Expressions

Introduction

List all the characters that you want included in the class within a set of brackets.

For example:

Demo Code

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

public class Main {
  public static void main(String[] args) {
    Pattern pattern = Pattern.compile("b[aeiou]t");
    Matcher matcher = pattern.matcher("bet");
    if (matcher.matches())
      System.out.println("Match.");
    else/*from w ww  .java 2 s  .com*/
      System.out.println("Does not match.");
  }
}

• Previous
• Next

Related Tutorials

• Create ranges for pattern with [a-z]
• Create classes for the first and last characters so they too can be upper- or lowercase:
• Let the pattern include uppercase letters as well as lowercase letters
• \w matches word character (a-z, A-Z, 0-9, or an underscore) and \W matches non word character
• Limit white space characters to actual spaces, just use a space in the regex.