Just to keep this thread up to date (because it just ended 4 hours of mental torture!), working in 6.5.2,
| rex field=User_name mode=sed "s/(\\\\)/\1\1/g"
worked for me to translate {anything & any case}\{anything} into the same with a double backslash.
Useful when building a multiselect source query listing users from hundreds of different servers.
Thanks to all the contributors on here for their efforts 🙂
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