Four bugs.

Fix: 

my ($earliest) = $str =~ /(\Q$first\E|\Q$second\E)/;
print( "$earliest\n" ) if defined( $earliest );

[download]

Update: Added 4th bug.

In reply to Re^2: out of two strings which occurs first in a text by ikegami
in thread out of two strings which occurs first in a text by Anonymous Monk

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