have a sentence:

I have a test.

Now, I want to know how many 2-word group in this sentence. I can do this using: New Regex("\b([a-zA-Z]+\s+(?=[a-zA-Z]+))\b") to get this #.

Is there a way to capture these 2-word groups?

in this example it should be:
I have
have a
a test

can we do this in regular expression directly?

thanks