h increasing length of
subject string. The <i>match_limit_recursion</i> number is a measure of how much
stack (or, if PCRE is compiled with NO_RECURSE, how much heap) memory is needed
to complete the match attempt.
</P>
<P>
When \O is used, the value specified may be higher or lower than the size set
by the <b>-O</b> command line option (or defaulted to 45); \O applies only to
the call of <b>pcre_exec()</b> for the line in which it appears.
</P>
<P>
If the <b>/P</b> modifier was present on the pattern, caus