#! perl
use strict;
use warnings;

my @regexen =
(
    q{\s+user\s"[^"]+"\s+password\s"[^"]+"\s+hash2\s+access(\s+console){2}} .
    q{(\s+new-password-at-login)?} .
    q{(\s+member\s"(default|engineer|networktest)"){2}(\s+exit){0,2}},

    q{\s+user\s"[^"]+"\s+password\s"[^"]+"\s+hash2\s+access(\s+console){2}} .
    q{(\s+new-password-at-login)?} .
    q{(\s+member\s"(default|READ-ONLY)"){2}(\s+exit){0,2}},

    q{\s+user\s"[^"]+"\s+password\s"[^"]+"\s+hash2\s+access} .
    q{(\s+(console|snmp|li)){3}\s+console(\s+new-password-at-login)?} .
    q{(\s+member\s"(default|LI|li-prof1)"){2}(\s+exit){0,2}},
);

my $n   = 1;
my %dic = map { qr{$_} => 'REPLACE' . $n++ } @regexen;
my $text;

{
    local $/ = '';      # Paragraph mode

    while (my $para = <DATA>)
    {
        for my $matchkey (keys %dic)
        {
            last if $para =~ s%$matchkey%$dic{$matchkey}%g;
        }

        $text .= $para;
    }
}

print $text;

__DATA__
 user "testuser1"
                password "08Cl3V.leJKU/GskqArA0Yp4MFo" hash2
                access console
                console
                    new-password-at-login
                    member "default"
                    member "engineer"

This paragraph doesn't match any of the regexen.

 user "v-test"
                password "VCp0GjSBK/KiWW.PgkQp7swXVMZ" hash2
                access console
                console
                    new-password-at-login
                    member "default"
                    member "READ-ONLY"