Is there a way to validate custom field input and send an error message if it does not satisfy the condition? Can this be done with scripted fields (Script Runner)?
Not scripted fields - they basically display stuff based on the code behind them, not check entry or validation.
You could use SR to write a validator though - I suspect it's a single line of code to check that an entry is 1 to 100, but validators only run on issue transitions.
The best bet is probably a SR "Behaviour" to check the input - that can work anywhere the field is available for edit.
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