Here's one way: 

#! perl -sw
use strict;

s[(?:\S+ ){2}\K((.).(..))][$2Y$3 $1], print while <DATA>;

=output

C:\test>junk56
col1 col2 cYl3 col3 col4 col5
1234 5678 9Y12 9012 3456 7890

=cut

__DATA__
col1 col2 col3 col4 col5
1234 5678 9012 3456 7890

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Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re: Search patern within pattern in a single substitute command by BrowserUk
in thread Search patern within pattern in a single substitute command by shobhit

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