How to find first and last word of sentence with Regular Expression

Hi all,

How to find first and last word in a sentence with Regular expression ?. Sentence is the code from SciTE. For example if sentence is;

"For $i = 0 to 15" 

I need to extract "For from the sentence

And the same way i need last word from a sentence

"If Apple = 15 Then" 

I need "Then" from the sentence.