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$PREMATCH Question

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From:
Jonathan Levi via macperl
Date:
February 3, 2016 01:59
Subject:
$PREMATCH Question
Message ID:
[email protected]
Can someone explain why the following:

echo alphabet | perl -e '$_=<STDIN>; if (m/pha/){print $PREMATCH, "\n"}'

yields "" instead of "al", as I expected?

Jonathan
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