comment on

I suppose you mean "standalone" word.

One way

Surround it with spaces but change the string separator to something different than spaces.

I chose a single quote ' here as separator but anything different goes, even XXX

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery
FootballPerl is like chess, only without the dice}

NB any instance of "trie" surrounded by anything else than spaces, like punctuation would be missed though.

Like trie! at the end of a phrase.

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