$re = '/Z=(?<mfcdst>\w{6})\sP=(?<mfcprio>\d)\sU=(?<mfcsrc>\w{6}),\sWW=(?<mfcWW>\d),\sL=(?<mfcline>.*)\sB=(?<mfctrunk>.*)\sD=(?<mfcdur>\d\d:\d\d)\sE:(?<mfcend>\w*);$/';
$str = 'ACC Stat;31.07.2018 23:54:39;;SVSA-ACC Z=999999 P=4 U=363898, WW=0, L=budvie0502 B=BUD Triangle D=00:00 E:Abweisend;';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php