RegEx pattern, code exacuting but doing nothing

Very new to RegEx I have data in cells like this

Col A
stuf 22-9989
stuff 559-6629
...
.
.
.
sfuff 1-66300

I want

Col A
stuf 22.9989
stuff 559.6629
...
.
.
.
sfuff 1.66300

My code is exacuting but doing nothing

Thanks

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1)

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2)

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But why not just

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Thank you romperstomper

Thank you AB33

Thank you jindon, no reason other then tring somthing new (RegEx looks helpful)