IDSYNCH ID PLUGIN MASK
The default function for the IDSYNCH ID PLUGIN MASK is:
iif( (size($LAST_NAME) > 0 && size($FIRST_NAME) > 0), substr($LAST_NAME[0], 0, 5) + substr($FIRST_NAME[0], 0, 1), "" )
First, the boolean expression ensures that there are values for $FIRST_NAME and $LAST_NAME . If check is successful, then it takes the 0-5 characters (first 6) of LAST_NAME and the 0-1 characters (first 2) of FIRST_NAME and put them together to form a user’s profile ID.
If the safety check fails, then it returns an empty string.