Task Sequence Options Tab - Task Sequence Variable Condition
Add a LIKE operator to the Task Sequence Options Tab - Task Sequence Variable Condition
Although not documented (?), this seems to be working in v1710. Please note, wildcard characters are "*" and "?". "%" does not work.
I'm using Task sequence variable _SMSTSMachineName like "K-*".
See also the ConfigMgrTeam comment on https://www.reddit.com/r/SCCM/comments/6zg9az/why_is_there_a_like_condition_for_task_sequence/