 limit to dd (any number of digits)
  \R         pass the PCRE_DFA_RESTART option to <b>pcre_dfa_exec()</b>
  \S         output details of memory get/free calls during matching
  \Z         pass the PCRE_NOTEOL option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
  \?         pass the PCRE_NO_UTF8_CHECK option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
  \&#62;dd       start the match at offset dd (any number of digits);
               this sets the <i>startoffset</i> argument for <b>pcre_exec()</b> 