regex, 1 off...

[namotco]

Let's say I want to search some text for "abc123".  However, we know  
people can make typos and so they could have entered avc123 or abc223  
or sbc123 or bc123 many other combinations...
So I want to search for those possibilities as well.  So how would I  
go about creating the proper regex?

Thanks!
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