Join clause regex pattern

I'm coming back to DG after not using it for a bit.  Looking at my old settings, there used to be one in code completion that allowed me to use a regex to have DG match based on the name of a field.  This was useful for when the field isn't part of the key.  

Did this functionality get moved or was it removed?

Old Setting: 

Column Pattern: (.*)
Target column pattern: .*\\.$1(?<!UPDATE_DTTM|UPDATE_USER)