Question

I’m trying to check a string with a regular expression, and this check should only pass if the string contains only *h, *d, *w and/or *m where * can be any number.

So far I’ve got this:

Pattern p = Pattern.compile("([0-9]h)|([0-9]d)|([0-9]w)|([0-9]m)");
Matcher m = p.matcher(strToCheck);
        if(m.find()){     
            //matching succesful code
        }

And it works to detect if there are any of the number-letter combinations present in the checked string, but it also works if the input is, for instance, “12x5d”, because it has “5d” in it. I don’t know if this is a code problem or a regex problem. Is there a way to achieve what I want?

EDIT:
Thank you for your answers so far, but as requested, I’ll try to clarify a bit. A string like “1w 2d 3h” or “1w 1w” is valid and should pass, but something like “1w X 2d 3h”, “1wX 2d” or “w d h” should fail.

Answer 1

use m.matches() or add ^ and $ to the beginning and end of the regex resp.

edit but if you wan sequences of these delimited by whitespace (as mentioned in the comments) you can use

Pattern.compile("\\b\\d[hdwm]\\b");
Matcher m = p.matcher(strToCheck);
while(m.find()){
    //matching succesful code
}