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// strings/TestRegularExpression.java

// (c)2021 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

*/