$re = '/(?<=\")(?:[a-z]+\"[a-z]+\"[a-z]+|[a-z][^"]+)(?=\")/mi';
$str = 'This is my "te
st" case
with lines for "tes"t"ing" with regex
But as he said "It could be an arbitray ammount of words"
with lines for "tes"t"ing"ing" with regex
';
preg_match_all($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