Regex for parsing out Apache common log (plus one extra field)

The below pattern parses out the fields from $str1 just fine but it doesn't work on to other strings.  Can you fix the regex pattern so it works on all strings?

Thanks, http://www.t1shopper.com/

$str1='67.195.37.124 - - [20/Apr/2010:05:32:22 +0000] "GET /us/ga/b.html HTTP/1.0" 200 1761 "-" "Mozilla/5.0 (compatible; Yahoo! Slurp/3.0; http://help.yahoo.com/help/us/ysearch/slurp)" "-"';

$str2='67.225.164.12 - - [03/Jan/2011:21:15:39 +0000] "GET / HTTP/1.1" 200 8973 "" "\"Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; Win 9x 4.90)\"" "-"';

$str3='77.238.196.184 - - [01/Jan/2011:20:54:07 +0000] "GET /tools/port-scan/result/?scan_host=cairosat.zapto.org&ports=2000&portscansubmit=Scan&port_start=&port_end= HTTP/1.1" 200 9640 "http://www.t1shopper.com/tools/port-scan/" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.8) Gecko/20100722 Firefox/2.0.0.3 \"MEGAUPLOAD 1.0\"" "-"';

$str4='91.55.106.90 - - [27/Dec/2010:17:16:07 +0000] "GET /ssi/t1shopper.js HTTP/1.1" 200 2012 "http://www.t1shopper.com/tools/port-scan/" "\"Bundestrojaner 2.0 - www.rettedeinefreiheit.de\"" "-"';

$str5='72.37.171.76 - - [22/Dec/2010:17:55:51 +0000] "GET /tools/calculate/ HTTP/1.0" 200 37778 "http://www.bing.com/search?q=\"kilobyte+to+megabyte\"+\"converter\"&src=IE-Address" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; InfoPath.2; MS-RTC LM 8)" "-"';

$log_pattern = '#^([^ ]+) ([^ ]+) ([^ ]+) \[([^\]]+)\] "([^ ]+) ([^ ]+) ([^/]+)/([^"]+)" ([^ ]+) ([^ ]+) "([^"]*)" "([^"]+)" "([^"]+)"#';

preg_match($log_pattern, $str2, $matches);

print_r($matches);

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PS: We've been working to get this Regex right for a few years but we keep having exceptions come up.  Here's the thread of past answers:
https://www.experts-exchange.com/Programming/Languages/Regular_Expressions/Q_26028925.html
https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_26184204.html
https://www.experts-exchange.com/Programming/Languages/Regular_Expressions/Q_25968268.html
https://www.experts-exchange.com/Programming/Languages/Regular_Expressions/Q_23544714.html