This code (which has been tested this time) will take a number like 1234567.89 and turn it into 1.234.567,89. 
perl -le 'print scalar reverse join "", map { s/(\d{2})\./$1,\b/; s/^(
+\d{1,3})$/\.$1/; $_ } (reverse sprintf("%.2f", shift)) =~ m/.{1,3}/g'
+ 1234567.89

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In reply to Print a number with grouping in a European style by integral

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