to match root@ ~#
Did you mean [root@hostname ~]#? Here is the regular expression to match it: qr/^\[root@\w*\s*~\]#/ (assuming that there can be a hostname after "@" and some kind of space character between the hostname and current directory).
Sorry if my advice was wrong.

In reply to Re: regular expression matching in expect by aitap
in thread regular expression matching in expect by cmastays

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