ch
includes the effect of PCRE2_NOTEOL.
</P>
<P>
2. If a pattern contains a lookbehind assertion, characters that precede the
start of the partial match may have been inspected during the matching process.
When using <b>pcre2_match()</b>, sufficient characters must be retained for the
next match attempt. You can ensure that enough characters are retained by doing
the following:
</P>
<P>
Before doing any matching, find the length of the longest lookbehind in the
pattern by calling <b>pcre2_pattern_info()</b>