he character beyond
the end of the pattern before calling <b>pcre2_regcomp()</b>. The pattern itself
may now contain binary zeros, which are treated as data characters. Without
REG_PEND, a binary zero terminates the pattern and the <b>re_endp</b> field is
ignored. This is a GNU extension to the POSIX standard and should be used with
caution in software intended to be portable to other systems.
<pre>
  REG_UCP
</pre>
The PCRE2_UCP option is set when the regular expression is passed for
compilation to the nat