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Use case
This use case prevents the execution of that transition if fix versions ending with ".x", e.g. 2.x, 3.x, 3.1.x have been selected. Often fix versions are added during a specific transition so this use case makes more sense when used in a validator.
Either way, you can hide the transition using the Condition based on regular expression or block the transition using the Condition and validation based on regular expression.
Configuration
Add the condition or the validator to the desired transition or create a new transition.
Value
Choose Value from field and in the subsequent field picker choose Fix versions
Regular expression
\.x #\ is used to escape the character .
Additional options
Case insensitive
Check this option to also include versions ending with ".X".
Negate condition
Check this option since fix versions with the specified ending should not be possible.
The following parameters are only available, if you are configuring this use case as a validator.
Screenshots
Related use cases
Use case JWT feature Workflow function Parser functions Label Prevent users from selecting specific fix versions 
If you still have questions, feel free to refer to our support team.
