$re = '/\'\w+#([0-9]+)\'/';
$str = '\'tex_to1#1234\' \'texto2#5678\' \'texto3#91011\' \'texto4#121314\' \'texto5#151617\' \'texto6#18\'';
preg_match_all($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