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RegEx needed to check for files not containing a string

I've got a set of .COM files in various directories
I'd like a RegEx (Run with Perl) which will check each .COM file in all subdirectories
And indicate which files do not contain a certain string, "version"
Any advice much appreciated, not quite sure where to start
1 Solution
perl -MFile::Find -le 'find(sub{(/\.COM$/&&-f)||next;local@ARGV=($_);/version/&&return while <>; print $File::Find::name},".")'
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