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Still it's working fine at my end with my code (post #2). Is it dos file? If yes then please substitute \r (CR/LF)first.

Hi, It's working at my end. Could you please attached your foo.cfg.
# cat foo.cfg
Test
Test_Account_1
Test_Account_2
# perl -nle 's/\bTest\b/Foo/g;print $_;' foo.cfg
Foo
Test_Account_1...

Have you removed the \s ?

Try with \b,
perl -pi -e 's/\b$CurrentName\b/$NewName/g' foo.cfg;