discrepancy in regular expression match using bufdo command

Hi,

I have a file contents as follows, i want to change the text from abc("def"); to
foo(("def")); in multiple files.

It works if i run the command, but the same thing fails if i run the same command using bufdo;

works-> :s/abc(\(.*\));/foo((\1));/gc

fails-> :bufdo execute "s/abc(\(.*\));/foo((\1));/"

error: E486: Pattern not found: abc((.*));



file contents:
-------------

abc("def);

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