Ruby on Rails

(Ruby 1.9.2) I have a simple validation regex which I need to pass the following values: "Billy-Bob" and "O'Kelley" (as test cases). Originally I was not allowing apostrophe but it became apparent I had to allow it.

The initial regex was:

/^[a-zA-Z -]*$/

Now, when I added the apostrophe like this:

/^[a-zA-Z' -']*$/

Then for some reason "Billy-Bob" was not getting matched:

> "Billy-Bob" =~ /^[a-zA-Z -']*$/
> nil
> "O'Kelley" =~ /^[a-zA-Z' -']*$/
> 0

But when I moved the apostrophe further in, then things work as desired an expected:

> "Billy-Bob" =~ /^[a-zA-Z' -]*$/
> 0
> "O'Kelley" =~ /^[a-zA-Z' -]*$/
> 0

Why is this?

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