C# regex question

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C#

Hello all,
I'm looking for a regular expression to pull reverse addresses out of a text file.

Sample String:

"123 Here is a sample string 123 234 456 567 and the string keeps going 123 234 456 567 and still going 789 232 111"

So, from this I would need anything in the format 2 or 3 Words + Number.

Correct matches would be:

Match 1: sample string 123
Match 2: string keeps going 123
Match 3: and still going 789

I believe I am close by using this as my regular expression:

"^([a-zA-z]+|[a-zA-z]+/s+[a-zA-z]+)+/s+[0-9]$"

However, still not getting results. Any ideas?

Thanks in advance,

Suraci.