<?php
$str = '[texttext]texttext[gjgjgjg][some]texttexttext[/some]';
'#\[some\](.*?)\[/some\]#i'
);
'<span>$1</span>'
);
echo $str;
?>
PD9waHAKCiRzdHIgPSAnW3RleHR0ZXh0XXRleHR0ZXh0W2dqZ2pnamddW3NvbWVddGV4dHRleHR0ZXh0Wy9zb21lXSc7CgokYmJfY29kZXMgPSBhcnJheSgKCScjXFtzb21lXF0oLio/KVxbL3NvbWVcXSNpJwoJKTsKCQokaHRtbF90YWdzID0gYXJyYXkoCgknPHNwYW4+JDE8L3NwYW4+JwoJKTsKCQokc3RyID0gcHJlZ19yZXBsYWNlKCRiYl9jb2RlcywgJGh0bWxfdGFncywgJHN0cik7CgplY2hvICRzdHI7Cgo/Pg==