Implement a pattern matcher for regular expressions
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.JFormattedTextField;
import javax.swing.JLabel;
import javax.swing.text.DefaultFormatter;
public class Main extends DefaultFormatter {
protected Matcher matcher;
public Main(Pattern regex) {
setOverwriteMode(false);
matcher = regex.matcher("");
}
public Object stringToValue(String string) throws java.text.ParseException {
if (string == null) return null;
matcher.reset(string);
if (! matcher.matches())
throw new java.text.ParseException("does not match regex", 0);
return super.stringToValue(string);
}
public static void main(String argv[]) {
Pattern evenLength = Pattern.compile("(..)*");
JFormattedTextField ftf1 = new JFormattedTextField(new Main(evenLength));
JLabel lab2 = new JLabel("no vowels:");
Pattern noVowels = Pattern.compile("[^aeiou]*",Pattern.CASE_INSENSITIVE);
Main noVowelFormatter = new Main(noVowels);
noVowelFormatter.setAllowsInvalid(false);
JFormattedTextField ftf2 = new JFormattedTextField(noVowelFormatter);
}
}
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