regexec and wild cards help

I want to find if a string matches this pattern:

tbzfile_????.tbz

where ? is a digit.

something like
pattern = "/^tbzfile_\d{4}.tbz$/";

Code:

---

if(pattern, strToBeSearched){
  //found
}else
  //not found
}

---

founds from posix..
take a look to the http://www.opengroup.org/onlinepubs/...s/regex.h.html