If I understand the problem, you want to find all files beneath a directory which contain a certain string, except ignoring the string when it falls in a comment block. Here's a solution that uses perl:
find . -type f -print0 | while read -d $'\0' f; do if perl -0777pe 's|
+/\*.*?\*/||gs' $f | grep certain_string >/dev/null; then echo $f; fi
+; done
Aaron B.
Available for small or large Perl jobs and *nix system administration; see my home node.
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