This program tests regular expression matching
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
/**
This program tests regular expression matching.
Enter a pattern and strings to match, or hit Cancel
to exit. If the pattern contains groups, the group
boundaries are displayed in the match.
@version 1.01 2004-05-11
@author Cay Horstmann
*/
public class RegExTest
{
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.println("Enter pattern: ");
String patternString = in.nextLine();
Pattern pattern = null;
try
{
pattern = Pattern.compile(patternString);
}
catch (PatternSyntaxException e)
{
System.out.println("Pattern syntax error");
System.exit(1);
}
while (true)
{
System.out.println("Enter string to match: ");
String input = in.nextLine();
if (input == null || input.equals("")) return;
Matcher matcher = pattern.matcher(input);
if (matcher.matches())
{
System.out.println("Match");
int g = matcher.groupCount();
if (g > 0)
{
for (int i = 0; i < input.length(); i++)
{
for (int j = 1; j <= g; j++)
if (i == matcher.start(j))
System.out.print('(');
System.out.print(input.charAt(i));
for (int j = 1; j <= g; j++)
if (i + 1 == matcher.end(j))
System.out.print(')');
}
System.out.println();
}
}
else
System.out.println("No match");
}
}
}
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