in reply to extract sentences with certain number of a character

Homework?

Why don't you show us what you've tried so far, or ask us for help on what you're stuck with?

Have you read perlretut?

Update: It's obviously too early for me. Sorry, AnonyMonk

Update^2: Have a look Using character classes particularly the bit about negated character classes.

Unless I state otherwise, my code all runs with strict and warnings
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