Two problems with your code

• the e modifier does not work for matches (m//), only for substitutes (s///).
• The @{ATTRIBUTE} form is incorrect (it even says to in the SOPW you pointed at)

The correct (i.e. no syntax errors, I can't vouch against logic errors) code is:

    print "attribute 0=\t$1\n" if m/${\ATTRIBUTE_0}='(.*)'/;
    print "attribute 1=\t$1\n" if m/${\ATTRIBUTE_1}='(.*)'/;
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