Thread: Pattern class

I read this book , Thinking in Java and I can't understand how did he managed to store this 2nd line of code (String , and regex) inside of args. Please help me. This bugs me all day. Here's program and output :


// Allows you to easily try out regular expressions.
// {Args: abcabcabcdefabc "abc+" "(abc)+" "(abc){2,}" }
import java.util.regex.*;
import static net.mindview.util.Print.*;
public class TestRegularExpression {
public static void main(String[] args) {
if(args.length < 2) {
print("Usage:\njava TestRegularExpression " +
"characterSequence regularExpression+");
System.exit(0);
}
print("Input: \"" + args[0] + "\"");
for(String arg : args) {
print("Regular expression: \"" + arg + "\"");
Pattern p = Pattern.compile(arg);
Matcher m = p.matcher(args[0]);

while(m.find()) {

print("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
Regular expression: "(abc){2,}"
Match "abcabcabc" at positions 0-8

[code == java ]

< // Allows you to easily try out regular expressions.
// {Args: abcabcabcdefabc "abc+" "(abc)+" "(abc){2,}" }
import java.util.regex.*;
import static net.mindview.util.Print.*;
public class TestRegularExpression {
public static void main(String[] args) {
if(args.length < 2) {
print("Usage:\njava TestRegularExpression " +
"characterSequence regularExpression+");
System.exit(0);
}
print("Input: \"" + args[0] + "\"");
for(String arg : args) {
print("Regular expression: \"" + arg + "\"");
Pattern p = Pattern.compile(arg);
Matcher m = p.matcher(args[0]);

while(m.find()) {

print("Match \"" + m.group() + "\" at positions " +
m.start() + "-" + (m.end() - 1));
}
}
}>

[/code]