Regular Expression problem

[mpjohnston]

So what I am trying to do is look at a string and replace (letter)-(letter) with (letter) - (letter).

For instance
$line = "Hi- my-name is joe-what is yours?"

then do some sort of str_replace so that $line changes to this:

"Hi- my - name is joe - what is yours?"

Any ideas?
TIA
Mike

[BeastRider]

$newstr = strtr("Hi- my-name is joe-what is yours?" , "-", " - ");

[mpjohnston]

that doesnt work... well it does butnot what I want it to do...

I want (letter)-(letter) only NOT (space)-(letter) or (letter)-(space)

something more along the lines of : [a-zA-Z]+-+[a-zA-Z]