I’m have a bit of trouble with the version 2.19 on the 1.6 it was simple I just did something like

$string = preg_replace("#[v](.+?)[/v]#is", "<embed src= 1 autostart='true' width='312' height='272'>", $string);

but in 2.19 Im not to sure where to start,, if you could point me in the right direction please!