validating directory and file name with preg_match

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I'm limiting access to certain proceedures based on the file trying to use 
them, and the directory they are located in on my server.  Right now I am 
using two preg_match statments as you will see.  What I want to know is 
this.  Is there a way to write a single regex for this that will supply the 
file name as a match, and only return if the directory is valid?

------------
//make sure we are calling from the propper directory, and get the file name 
that included to determine
//database access needs
preg_match('#^C:\\\\Inetpub\\\\wwwroot\\\\folder\\\\(entry|edit)\\\\(\w*\\.(php|pdf))#i', 
$included_files[0], $check1);
preg_match('#^C:\\\\Inetpub\\\\wwwroot\\\\folder\\\\(\w*\\.(php|pdf))#i', 
$included_files[0], $check2);
if(isset($check1)){
 if(is_array($check1)){
  $matches[4] = $check1[2];
 };
 unset($check1);
};
if(isset($check2)){
 if(is_array($check2)){
  $matches[4] = $check2[1];
 };
 unset($check2);
};
if(isset($matches[4]){
more code here
}; 



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