Re^2: perl expect

Just a raw beginner's question but in the last line of this code - what does the 'gr' in gr'[#>:] $' mean? I realize he's looking for the prompt at the end of a line but I can't find a reference to the 'gr' syntax anywhere.

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Re^3: perl expect by Anonymous Monk on Dec 07, 2016 at 19:57 UTC
See `qr/STRING/msixpodualn` in Regexp Quote Like Operators: This operator quotes (and possibly compiles) its STRING as a regular expression. ...	[reply] [d/l]
Re^4: perl expect by ogg (Initiate) on Dec 07, 2016 at 20:19 UTC
Thanks! I very much appreciate it.	[reply]