you only need parentheses when there's a capture

Are they not also needed where there is optionality?

Could this be (sensibly) rewritten without the parenthesis? 

$example =~ s/hiss(es)?/leak/;

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To substitute hiss/hisses for leak but not substitute hisse or hisss.

In reply to Re^3: regex in REPLACEMENT in s/// by Bod
in thread regex in REPLACEMENT in s/// by perlboy_emeritus

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