tch_t</i> as well as the <i>regoff_t</i> typedef it uses are defined in
<b>pcre2posix.h</b> and are not warranted to have the same size or layout as other
similarly named types from other libraries that provide POSIX-style matching.
</p>
<p>
A successful match yields a zero return; various error codes are defined in the
header file, of which REG_NOMATCH is the "expected" failure code.
</p>
<h2><a name="SEC7" href="#TOC1">ERROR MESSAGES</a></h2>
<p>
The <b>pcre2_regerror()</b> function maps a non-zero errorc