My regex does not work

T开发者_StackOverflow中文版his code does not return the correct result:

Pattern p=Pattern.compile("^[y]{1,4}$|^[m]{1,4}$|^[d]{1,4}$");

String text1="yyyy";
String text2="mmm";

Matcher m=p.matcher(text);
boolean b=m.find();
System.out.println(String.valueOf(b));

m=p.matcher(text2);
b=m.find();
System.out.println(String.valueOf(b));

The line System.out.println(String.valueOf(b)); prints false I want it to return true. Does anyone see what's wrong with the code?

A simpler regex could be:

^(y{1,4}|m{1,4}|d{1,4})$

UPDATE1: I've checked your regex as well, and it's syntactically correct but maybe the Java regex engine does not like it.

UPDATE2: I even checked your Java code and it works for me with only one exception that in the first part it's text1 instead of text what you've typed.

It prints out true for me in my JVM, so the problem is probably not with your regex.