It's almost indentical to your subject:

Replace $a with $b if $a ne $b
$a = $b if $b ne $a;

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which simplifies to:

$a = $b;

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Or maybe you wanted

$a = $b unless $a =~ /$b/;

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In reply to Re: Replace $a with $b if $a ne $b by ikegami
in thread Replace $a with $b if $a ne $b by Anonymous Monk

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