in reply to Re^2: Problem using value of variable in a regular expression
in thread Problem using value of variable in a regular expression
It's not undesirable at all. In double quotes, the backslash is indicates the start of an escape allowing "\n" to mean newline, "\"" to mean a double quote, etc. Double quotes are documented in perlop.
You're just using the wrong tool.
$failmsg = qr/\*E/;
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