The parentheses in regular expressions define so called "capture groups". Originally, you had two capture groups:
m/<tagid=(\d*)([[:alpha:]]*)>/
<~~~><~~~~~~~~~~~~>
#1 #2
The variables $1 and $2 contain the parts matched by the respective capture groups. \d* means "zero or more digits", [[:alpha:]]* means "zero or more characters". In your new regex, you don't have any parentheses:
m/<endnote id=/
So $1 and $2 aren't populated.
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
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