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Regular Expressions

Regular Expressions

Regular Expressions

I'm trying to parse the apache.log file and have a function working that does so, but I know little about regex and could not parse it directly. I reviewd and tried just about every posting I could find here and on other sites but nothing worked. Please see $pattern below and can tell me how to parse each section without the ugly work-arounds? This is for the local development copy of the log which is truncated (without the last two columns) but I would like to use the same code to also parse the live NCSA combined log format. Any help is appreciated.


function ParseLocalToScreen($path) {
	global $output;
	// Parses the local Windows Apache development Log Format lines:
	// REF RAW LOG: - - [27/Apr/2014:15:00:24 -0700] "GET / HTTP/1.1" 200 3051
	// REF PARSED OUTPUT:, -, -, 2014-04-27 15:00:24, GET, /, HTTP/1.1, 200, 3051
	$pattern = '/^(\S+)\s '; // Remote Host
	$pattern .= '([^\s]+) '; // Log Name
	$pattern .= '([^\s]+) '; // User
	$pattern .= '\[(\d+)\/(\w+)\/(\d+):(\d{1,2}:\d{1,2}:\d{1,2} '; // Datetime WORKS SO-SO
	$pattern .= '?[\+\-]?\d*)\] "(.*)/'; // Remainder
	if (is_readable($path)) :
		$fh = fopen($path,'r') or die($php_errormsg);
		while (!feof($fh)) :
			$s = fgets($fh);
			if (preg_match($pattern,$s,$matches)) :
				list($whole_match, $remote_host, $logname, $user, $day, $month, $year, $time, $remainder) = $matches;
				$month = date('m', strtotime($month)); // Converts short month to numeric
				$time = trim(substr($time,0,-6)); // Removes -0800 offset
				$replacements = array(' ', '"');
				$remainder = str_replace($replacements, ', ', $remainder); // Removes extra space and quote
			// REGEX NOT WORKING: remove extra field, build datetime and other output for MySQL
			$output .= str_replace(", , ", ", ", "$remote_host, $logname, $user, $year-$month-$day $time, $remainder<br>\n");
		echo $output;
	else : 
		echo "Cannot access log file!";

RE: Regular Expressions


Sorry, no time for detailed analysis now, just a quick question. You know that strtotime() is able to parse that date format ?

CODE --> php -a

Interactive mode enabled

php > var_dump(date('c', strtotime('27/Apr/2014:15:00:24 -0700')));
string(25) "2014-04-28T01:00:24+03:00" 


RE: Regular Expressions

Yes, thank you, and no real rush. I did know that but I was expecting the regex to provide the date as a single variable using list() but instead it gives it in bits and pieces, which is the main issue here. When I first wrote the function it used a pattern something like:


$pattern = '/^([^ ]+) ([^ ]+) ([^ ]+) (\[[^\]]+\]) "(.*) (.*) (.*)" ([0-9\-]+) ([0-9\-]+) "(.*)" "(.*)"$/'; 

and to assign variables, it was using:


list($whole_match, $remote_host, $logname, $user, $date_time, $method, $request, $protocol, $status, $bytes, $referer, $user_agent) = $matches; 

. . . where $date_time was providing what was needed for formatting. Somehow I broke it but finally realized that each bit of the date and time is now being broken down to individual variables so to get it to work I simply put them back together in the needed order but it's inelegant and ugly that way!

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