$s = 'Two words';
$s =~ s[(^\S+)(\s.*\s)(\S+$)][$3$2$1]; 
print $s;
#Two words

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Oops! ;-)

In reply to Re^4: How do I reverse the order of the first and last word of a string? by Not_a_Number
in thread How do I reverse the order of the first and last word of a string? by ferrispike12

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