Getting the Indices of a Matching Group in a Regular Expression : Group « Regular Expressions « Java

1. Java
2. Regular Expressions
3. Group

Getting the Indices of a Matching 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 {

    CharSequence inputStr = "abbabcd";
    String patternStr = "(a(b*))+(c*)";

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

    if (matchFound) {
      // Get all groups for this match
      for (int i = 0; i <= matcher.groupCount(); i++) {
        // Get the group's captured text
        String groupStr = matcher.group(i);

        // Get the group's indices
        int groupStart = matcher.start(i);
        int groupEnd = matcher.end(i);

        // groupStr is equivalent to
        inputStr.subSequence(groupStart, groupEnd);
      }
    }
  }
}

 

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