... finding reverse of the same problem ... find partially mismatched lines.

There is again a lack of clarity. I would define the "reverse of the same problem" as "find all lines in file1 that do not match any string in file2 as a substring." But "find partially mismatched lines" can be taken IMHO to mean "find all lines in file1 in which some part does not match any string in file2." All lines in file1 have some part that does not match anything in file2, but I doubt this is what you really mean.

If I take the former of the two interpretations above as your intended requirement ("find all lines in file1 that do not match any string in file2 as a substring"), then the code provided by BillKSmith here can easily be adapted by changing the statement
    print grep { $_ =~ $match } @a1;
to
    print grep { $_ !~ $match } @a1;
(!~ vice =~). This change produces the output you seem to be specifying here.

Again, please see How do I post a question effectively?, How (Not) To Ask A Question and I know what I mean. Why don't you? for help with asking questions more clearly: Please help us to help you. (And please do try to take a look at Short, Self-Contained, Correct Example and How to ask better questions using Test::More and sample data.)

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: partial matching of lines in perl by AnomalousMonk
in thread partial matching of lines in perl by Sidd@786

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