/<para0[^>]*?>
 (?: \s* (?: <title .*?<\/title>
            |<para .*?<\/para>
            |<applic .*?<\/applic>
            |<capgrp .*?<\/capgrp>
            |<subpara1 .*?<\/subpara1>
            |<caution .*?<\/caution>  ) )*?
 \s* (<warning .*? <\/warning>)
 (?: \s* (?: <title .*? <\/title>
            |<para .*? <\/para>
            |<applic .*? <\/applic>
            |<capgrp .*? <\/capgrp>
            |<subpara1 .*? <\/subpara1>
            |<caution .*? <\/caution>
            |<warning .*? <\/warning>  ) )*?
 \s* <\/para0>                             /sx