$re = '/(?:\W|^)(alineas|alinea|alis\.?|ali\.?) (?:([a-z])|\"([a-z])\")(?:\W|$)/m';
$str = 'alinea a,
alinea "a",
ali. "a",
ali "a",
ali. a,
ali. "a",
ali. a",
ali a
';
preg_match_all($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