Using a Non-Capturing Group in a Regular Expression : Group « Regular Expressions « Java

1. Java
2. Regular Expressions
3. Group

Using a Non-Capturing Group in a Regular Expression

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

public class Main {
  public static void main(String[] argv) throws Exception {

    String inputStr = "abbabcd";
    String patternStr = "(a(?:b*))+(c*)";
    // (?:b*) is a non-capturing group

    Pattern pattern = Pattern.compile(patternStr);
    Matcher matcher = pattern.matcher(inputStr);
    boolean matchFound = matcher.find();

    if (matchFound) {
      for (int i = 0; i <= matcher.groupCount(); i++) {
        String groupStr = matcher.group(i);
      }
    }
  }
}

 

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