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  1. or download this
    my $pattern = qr{HOSTNAME:\s*(?:\d{4}-)?\Q$hostname_for_regex\E(grbr-r
+wan-x)\s+GRBR:\s*\Q$dev_ref->{grbr}\E}ixms;
  2. or download this
    my $pattern = qr{            # quoted regex
    HOSTNAME:                # Literal text
...
    \s*                      # 0 or more whitespace
    \Q$dev_ref->{grbr}\E     # Just the GRBR
    }ixms;