regex - Text replacement in all the files in a directory -

in windows 2008, have multiple files in directory. files having paths contents , texts should replaced other string.find example below:

the files having paths like:

file1:

c:\apps\ etc\a1\x.exe should replaced c:\apps\ exe\x.exe

file2:

c:\apps\ etc\b1\y.exe should replaced c:\apps\ exe\y.exe

i trying find single command replace bold lettered strings mentioned above.

in case of normal strings use below command , works:

perl -i.bak -pe "begin{@argv = map glob, @argv} s/string1/string2/g" ./*.txt  

but current requirement seems use regular expression not able find solution.

just replace etc\ followed \ again exe:

's/etc\\[^\\]*\\/exe\\/g'