java extract substring from string

/**
 * @author lautturi.com 
 * Java example: extract string in java
 */
import org.apache.commons.lang3.StringUtils;

public class Lautturi {
	
	public static void main(String[] args) {
		String str = "<!-- comment line -->";
		String substr = StringUtils.substringBetween(str, "<!--", "-->");
		System.out.println(substr);
	}
}

output:

comment line