Extracting the first sentence out of a block of text

I need to extract the first sentence out of a block of text. The sentence will end with a period, exclamation point, or question mark followed by a space.

[listwords]
when used with "delimiters" can redefine the meaning of what a word is.
[listwords words=[your words go here]&delimiters=.!?]
[showif [index]=1]
The first sentence is: [word]
[/showif]
[/listwords]
Joe D'Andrea

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