I'm a bit surprised that I didn't notice anybody offering the simple, obvious solution: 

s/(\s+$RE)+$//;

[download]

(tested) Update: One was hidden in the middle of gamache's sentence.

- tye        

In reply to Re: regexp - repeatedly delete words expressed in alternation from end of string (KISS) by tye
in thread repeatedly delete words expressed in alternation from end of string [regexp] by princepawn

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