How to create a calculated field eval coalesce follow by case statement?

[ejwade]

I'm trying to create a calculated field (eval) that will coalesce a bunch of username fields, then perform match() and replace() functions within a case statement.

Here's a scenario:

• Possible user fields: UserName, username, User_ID
• User values need domain removed (e.g., "user@domain.com" or "ad\user" needs to be "user").

Here is how it can be done in two evals (I newlined and indented each case for readability):

| eval user_coalesced = coalesce(UserName, username, User_ID)
| eval user = case(
  match(user_coalesced, ".*@.*"), replace(user_coalesced, "@.*", ""),
  match(user_coalesced, "^ad\\\\"), replace(user_coalesced, "^ad\\\\", ""),
  true(), user
)

 Any ideas on how I can get this down to one? I thought about putting the coalesce() into each case, but that seems inefficient.