When using the 'I need to extract a value from a multivalued attribute' option under 'Manage User Attributes', the only filter option available is:
'Match attributes with this prefix (and strip prefix)
This filter will result in the search prefix being removed from the output.
There is no option to keep the search prefix.
For example if wanted to filter the 'memberof' attribute and you had these groups:
You could use the 'prod_' prefix to filter only the prod groups, however the output would remove the 'prod_' prefix and result in:
So the output does not contain the full group name.