// strings/TestRegularExpression.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Simple regular expression demonstration
// {java TestRegularExpression
// abcabcabcdefabc "abc+" "(abc)+" }
import java.util.regex.*;

public class TestRegularExpression {
 public static void main(String[] args) {
 if(args.length < 2) {
 System.out.println(
 "Usage:\njava TestRegularExpression " +
 "characterSequence regularExpression+");
 System.exit(0);
 }
 System.out.println("Input: \"" + args[0] + "\"");
 for(String arg : args) {
 System.out.println(
 "Regular expression: \"" + arg + "\"");
 Pattern p = Pattern.compile(arg);
 Matcher m = p.matcher(args[0]);
 while(m.find()) {
 System.out.println(
 "Match \"" + m.group() + "\" at positions " +
 m.start() + "-" + (m.end() - 1));
 }
 }
 }
}
/* Output:
Input: "abcabcabcdefabc"
Regular expression: "abcabcabcdefabc"
Match "abcabcabcdefabc" at positions 0-14
Regular expression: "abc+"
Match "abc" at positions 0-2
Match "abc" at positions 3-5
Match "abc" at positions 6-8
Match "abc" at positions 12-14
Regular expression: "(abc)+"
Match "abcabcabc" at positions 0-8
Match "abc" at positions 12-14
*/