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Magic! thanks a lot!
the solution 1 works with a small adaptation as there are no 'space' ('_') before the dots ('.xyz' instead of '_.xyz'). the expression FIND '\.' and REPLACE WITH '0\.' do not preserve the '1.000', resulted modified into '10.000', but the last can be easily undo by means of the ...

Hi all,
forgive to me but I need a help with Reg Ex.
in the following matrix of data (space delimited), I need:
1) to transform any numeric value ".xyz" in "0.xyz" (preserving the 1.000)

than, about column headers (usually the first lane of the matrix) and the same in the first column of the matrix ...

YESS!!
it works!
very condensed RegEx and efficacious.
Thanks also for the suggestion about repetition operator {...} and the backslashing of literal . (dot)
but the use of groups () and of the pipe | is magic!!
Thanks a lot
bye

Hi all
From a complete list (C) of text lines I have to cut away some of them (S1, S2, S3, S3..Sn), and paste them (S1, S2, S3..Sn) at the bottom of the remaining list (R).
To select the lines tu cut away, I have defined some RegEx (RE1, RE2, RE3..REn) listed at the top of the complete list (C).
ex ...