We can create a small-articles-word-list by using a Negative LookAhead place before the \w+. FInd:
\b(?!(at?|and?|but|by|for|in|nor|o[fnr]|the|to|up|with)\b)\w+
Change:
\u$0
Here, for the words: a, at, an, and, but, by, for, in, nor, of, on, or, the, to, up, with
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