regex - How does pattern matching works using perl -

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i have variables a:b:c a:b:d c:d:e , need output displayed a-b a-b c-d

i try following code

$res="a:b:c a:b:d c:d:e";  $res=~s/\:/\-/g;  $res=~s/..$//mgs; print "$res\n";

but did not receive output

use strict; use warnings; $res = "a:b:c a:b:d c:d:e"; $res =~ s{([a-z]):([a-z]):[a-z]}{$1-$2}ig;

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