You could first apply a red font to the whole document, then use a wildcard Find/Replace like:
Find = First name: [!.]@. Last name: [!.]@. Username: [!.]@. Password: [!.]@.[^1^13]
Replace = ^&
with the replacement font colour set to automatic.

Any unmatched lines will remain red-coloured.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]