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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). Example:

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

See "Performance issues" above for the serious performance implications of using this variable (even once) in your code.

This variable is read-only and dynamically-scoped.

Mnemonic: ' often follows a quoted string.