正则表达式的简单应用实例

import java.io.*;
import java.util.regex.*;

public class Printer {
public static void main(String[] args) {
System.out.println("
Please enter the input string:
");
BufferedReader reader =
new BufferedReader(new InputStreamReader(System.in));
String inputString;
boolean isOK = false;
try {
while(!isOK) {
if((inputString = reader.readLine()) != null) {
if(inputString.length() > 200) {
System.out.println("The string
exceeds 200 characters.
Please enter again!
");
}
else {
Pattern regex = Pattern.compile("[^@#$%&*/^]+");
Matcher matcher = regex.matcher(inputString);
boolean isMatched = matcher.matches();
if(!isMatched) {
System.out.println("The String cant
contain @,#,$,%,*,& and ^.
Please enter again!
");
}
else {
isOK = true;
System.out.println("
Your input
string is:
" + inputString);
}
}
}
}
}
catch(IOException e) {
e.printStackTrace();
}
}
}