$re = '/^(.*.+)$/m';
$str = '// Resources for SEEN0001.TXT
#character \'美佐枝\'
#character \'春原\'
#character \'ボタン\'
<0000> \\{美佐枝}You little goblin...
<0001> Unable to contain her fury, Misae grabs both of Sunohara\'s legs...
<0002> \\{春原}Heh?
<0003> ...and proceeds to use her killing move, The Giant Swing.
<0004> \\{美佐枝}Uryaaaaaaaaaaaaaaaaaaa!
<0005> \\{春原}Uwaaaaaaaaaaaaaah!
<0006> \\{ボタン}Puhiiii.
<0007> \\{春原}Uwaaaaaaaaaaah!
<0008> \\{春原}Uwaaaaaaaaaaah!
<0009> \\{春原}Uwaaaaaaaaaaah!
<0010> \\{春原}Geeh!
<0171> \\size{intA[1001]}*BOOM*\\size{}\\shake{4}
<0145> \\size{intA[1001]}Dammit! Stupid rugby players!!\\size{}
';
preg_match_all($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