Question

求一正则表达式 两位正整数 1-90

Answer 1

^[1-9][0-9]?$

class Pattern
{
public static void main(String[]args)
{

java.util.regex.Pattern p=java.util.regex.Pattern.compile("^[1-9][0-9]?$");
String str;
Scanner in=new Scanner(System.in);
while(in.hasNext())
{
str=in.nextLine();
Matcher matcher=p.matcher(str);
if(matcher.matches())System.out.println("good");
else System.out.println("bad");
}

}

}