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TestRegularExpression.java
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// 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
*/