$' - Perldoc Browser

#$POSTMATCH

#$'

The string following whatever was matched by the last successful pattern match (not counting any matches hidden within a BLOCK or eval() enclosed by the current BLOCK). (Mnemonic: ' often follows a quoted string.) Example:

$_ = 'abcdefghi';
/def/;
print "$`:$&:$'\n"; 	# prints abc:def:ghi

This variable is read-only.

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