 segment begins "cx", a match should be found, but this will only
happen if characters from the previous segment are retained. For this reason, a
"no match" result should be interpreted as "partial match of an empty string"
when the pattern contains lookbehinds.
</P>
<P>
4. Matching a subject string that is split into multiple segments may not
always produce exactly the same result as matching over one single long string,
especially when PCRE2_PARTIAL_SOFT is used. The section "Partial Matching and
Word Bou