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$MULTILINE_MATCHING
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$MULTILINE_MATCHING

Set to 1 to do multi-line matching within a string, 0 to tell Perl that it can assume that strings contain a single line, for the purpose of optimizing pattern matches. Pattern matches on strings containing multiple newlines can produce confusing results when ``$*'' is 0. Default is 0. (Mnemonic: * matches multiple things.) Note that this variable influences the interpretation of only ``^'' and ``$''. A literal newline can be searched for even when $* == 0.

Use of ``$*'' is deprecated in modern perls.

Source: Perl predefined variables
Copyright: Larry Wall, et al.

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$MULTILINE_MATCHING $*

$MULTILINE_MATCHING
$*