With just one /e modifier, you keep the $1. A trivial test would have shown that: 
$ perl -wE '$r = q{bar$1}; $_ = "foo"; s/(fo)o/$r/e; say'
bar$1

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In reply to Re^2: Slurping search-replace patterns from a file by JavaFan
in thread RESOLVED: Slurping search-replace patterns from a file by HKS

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