Yeah, Net::Telnet is rather old and uses a weird method of passing regexes as arguments. For a more recent module qr// would be appropriate, but Net::Telnet requires a string that starts and ends with a slash.
The other posters are right when they say you should double quote. Any method for building strings will work:
As an aside, if you're trying to log in, there's a login method in Net::Telnet.
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