ereg help

[L8knight]

I have a php page that opens a log file and reads it into $data. I am trying to then search through $data and find which drive letter was recorded in the log file... but I can not get it to work:

$data=file($rfile) or die("Couldn't Read File");
		//get drive information from report
			$finddrive = ".:\\\";
			echo $finddrive;
			if (ereg($finddrive, $data, $reg)) echo "Drive information: '$reg[0]'";
			exit;

The only result I get is a warning:

Warning: ereg(): REG_EESCAPE:7trailing backslash () in c:\WebDev\generate.php on line 96

The file contains the following text (which gets read into $data):

Status = termination requested.

File list

F:\

Any help would be appreciated. I thought it might be that I need to somehow loop through $data ? Not sure since I am a newbie.

Thanks in advance!

[bubblenut]

Here's a bit of a tighter version which will avoid matching things which aren't actually drive descriptions.

$data=file($rfile) or die("Couldn't Read File");
//get drive information from report
$finddrive = '/^([A-Z]):\\\\\\\\$/';
echo $finddrive;
if(preg_match($finddrive, $data, $matches))
  echo("Drive letter is: '".$matches[1]."'");
exit();

and here's a breakdown.
The two slashes (/) at the begining and the end of the expression are just delimeters. If you wanted to ad modifiers (for example case insensitivity (i) you would place these after the final delimeter. The caret (⁾ means that the expression must begin at the start of a line, as it is in the log file example you gave. Then we have this ([A-Z]) this is a character class accepting only upper case letters wrapped in parenthesis. This is the part of the regex we want to grab. Then we have the rest of the drive bit (:\\) with remembering to escape backslashes properly. Finally we have the dollar sign ($) which states the end of the regex must be at the end of the line (in this case the regex must be one complete line, no more and no less).

HTH
Bubble

[L8knight]

Okay, I used that... and I now get this error:

Warning: preg_match() expects parameter 2 to be string, array given in c:\WebDev\generate.php on line 96

Which points me back to what I was saying earlier... since I read the file into $data it is an array.... so how do I go through $data to find the match?

[benklocek]

try this.

$data_array=file($rfile) or die("Couldn't Read File"); 

//get drive information from report 
$pattern = '/^([A-Z]):\\\\$/'; 

//loop through the array
foreach ($data_array as $data) {

if (preg_match($pattern, $data, $matches) { 
       echo("Drive letter is: '".$matches[1]."'");
    }
else {
       echo "Failed match on $data<br />";
    }
}

[L8knight]

Cool. Thanks! I had to mod it a little for it to work... it would go through the file but wouldn't match anything until I took out the "\"
Here is the final code:

$pattern = '/^([A-Z]):/'; 
		//loop through the array
			foreach($data as $data_array) {
				if (preg_match($pattern, $data_array, $match)) 
					{ 
       				echo("Drive letter is: '".$match[0]."\\'<br />");
    				}
				else {
       			echo "Failed match on $data_array<br />";
    			 	 }
			}

Thanks again for your help! So glad to have this done.