$re = '~:.+?\.txt(*SKIP)(*FAIL)|\s+~m';
$str = '\'128.000000 5.000000 2-level SCT3030AL C:\\\\Users\\\\Tex\\\\Desktop\\\\Test 2 do Project GUI - Opt - Copy\\\\Vectors\\\\Ripple = 0.3\\\\TwoLev9.6kHz_Ripple_0.3.txt 9600.000000\'';
preg_match_all($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