Regular expression script

[zer0]

I need a script to rename a section of 3 digits enclosed by dots (say .234.) into something like this ".X12Y34." (letters and digits are examples). Using this script line, I can insert the "X1" part, but struggling with the "Y" since it would need adding \w\d as the string would now be 1 letter and 4 digit long.

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rename r , '\.(\d\d\d)\. > .X1$1.' ;

Any help please? Cheers!

[highend]

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rename r , '\.(\d)(\d\d)\. > .X1$1Y$2.' ;

[zer0]

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rename r , '\.(\d)(\d\d)\. > .X1$1Y$2.' ;

Thanks very much