[Solved] A perl script to list all the exceptions and their number of occurrence

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Your perl backreferences are incorrect:

perl -lne '$a{$1}++ if (/^(Unexpected exception) : (.*?)\s*$/)
                          ^^^^^^^^^^^^^^^^^^^^^-$1 ^^^^^-$2

You want

 $a{$2}++

instead. Or convert that first () to a non-capturing group: (?:Un....)

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solved A perl script to list all the exceptions and their number of occurrence