Regex to validate characters and numbers concatenated with -

I'm trying to match a string that Characters and numbers cannot be concatenated, if you want to concatenate use a hyphen.

For example, these should all match:

abc-123-123-***
123-abc-abc-***
123-abc-123-***
abc-123-abc-***
abc-efg-***

not match:

abc123
123abc
abc1
a1b2 Please help me to find a javascript regex.

Please help me to find a javascript regex.

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