Re^2: Search patern within pattern in a single substitute command

Looking back now, I knew nested pattern ((.).(..)) and should have thought about it here. It turned out to be the key. What does the \K mean? If I don't include it I get o/p

col2 cYl2 col3 col4 col5
5678 5Y78 9012 3456 7890
[download]

W/o \K the following works too, but I would like to understand \K

s[(.{5})((.).(..))(.*)][$1$2 $3Y$4$5], print while <DATA>;
[download]

This is something I would have written if I had thought about the nested pattern in the first place....

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Re^3: Search patern within pattern in a single substitute command by BrowserUk (Patriarch) on Mar 04, 2011 at 05:24 UTC
What does the \K mean? from Perldoc perlre: "Character Classes and other Special Escapes" `\K Keep the stuff left of the \K, don't include it in $&` [download] It says that the bit of the regex preceding it is only used to locate the part of the string to be replaced, but isn't a part of the substitution. It just saves the need for an extra capture. Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply] [d/l]
Re^4: Search patern within pattern in a single substitute command by shobhit (Sexton) on Mar 04, 2011 at 05:40 UTC
Makes sense. Thanks a lot for your help.	[reply]