everyone

I would like to delete a value from the postmeta in my wordpress installation - and not a complete metavalue, but only part of the content in it.

e.g. metakey = test
metavalue = abba; dancing; queen;

and the "dancing" should be thrown out.
With update\_post\_meta and delete\_post\_meta I only manage to delete the complete metavalue or metakey.
update\_post\_meta( $id, 'test', $dancing);
delete\_post\_meta( $id, 'test', $dancing);
dont work :-(

how can i remove only part of it?

lg
yeah