What steps have you undertaken to debug this issue?
What values does $b-> and $a-> have? How could you find this out yourself?
What does the following code output?
Compare the output with
Maybe you want to read Regexp Quote-Like-Operators on how m/.../ behaves in list context.
Update: My interpretation of your input data might be off-base. Still, the debugging steps outlined above still hold.
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Want more info? How to link
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