dynamically replace = to " = " when followed by [A-z0-9]

Hi,
I am trying to replace "=" by " = " only when the previous character is [A-z0-9]
so, "blah=" should be dynamically replaced by "blah = ", but not !=.

In a vim, I can do this by

%s/\v([A-z0-9])\=/\1 = /g

but, can it be dynamic, or atleast check the current line for every = entered and replace that?

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