Regular Expression Perl

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  4. The m modifier controls the behavior of the $ and ^ anchor metacharacters
# Anchors and the m modifier
$_="\nTomorrow will never be here.\n";
print if /^Tomorrow/;    # Embedded newline
$_="\nTomorrow will never be here.\n";
print if /\ATomorrow/;   # Embedded newline
$_="\nTomorrow will never be here.\n";
print if /^Tomorrow/m;
$_="\nTomorrow will never be here.\n";
print if /\ATomorrow/m;
$_="\nTomorrow will never be here.\n";
print if /history\.$/m;