[^,"\r\n]+\r?\n[^,]*)(?=,|$)~', '"$0"', $matches[0]); } preg_match_all('~\G,?[^,\r\n]++~', $source, $cols); $row_regex = '~^(?:(?:(?:"[^"*]")+|[^,]*)(?:,|$)){' . count($cols[0]) . '}$~m'; $result=preg_replace_callback($row_regex, 'add_quotes', $source); print($result); ?>