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  1. or download this
        "... LIKE '%" . quotemeta($str) . "%' ..."
  2. or download this
        my $pattern= $string_from_user;
    $pattern =~ s#(['%_\[\]])#\\$1#g;
    "... LIKE '%$pattern%' ..."
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        LIKE '%\\\\\%%'
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        # Escape "wildcard" characters in user input:
    my $pattern= quotemeta($string_from_user);
    # Escape things processed by 'single quote' parsing:
    $pattern =~ s#([\\'])#\\$1#g;
    "... LIKE '%$pattern%' ..."