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#! /usr/bin/perl -w

...
print "foobar" =~ /$re/ ?"true":"false"; print "\n";
print "\\nfoo =~ \/$re\/ \t";
print "\nfoo" =~ /$re/ ?"true":"false"; print "\n";

(?^:foo$)
foo\nbar\n =~ /(?^:foo$)/s      false
...
foo =~ /(?^:foo$)/      true
foobar =~ /(?^:foo$)/   false
\nfoo =~ /(?^:foo$)/    true

                /m      /s      none
foo/bar/        F       F       F
...
foobar          F       F       F
bar/foo/        T       T       T
bar/foo         T       T       T