Documentation update.

doc/pcre2api.3

@@ -1,4 +1,4 @@
-.TH PCRE2API 3 "02 September 2018" "PCRE2 10.32"
+.TH PCRE2API 3 "07 September 2018" "PCRE2 10.32"
 .SH NAME
 PCRE2 - Perl-compatible regular expressions (revised API)
 .sp
@@ -2768,7 +2768,7 @@ Elements in the ovector that do not correspond to capturing parentheses in the
 pattern are never changed. That is, if a pattern contains \fIn\fP capturing
 parentheses, no more than \fIovector[0]\fP to \fIovector[2n+1]\fP are set by
 \fBpcre2_match()\fP. The other elements retain whatever values they previously
-had.
+had. After a failed match attempt, the contents of the ovector are unchanged.
 .
 .
 .\" HTML <a name="matchotherdata"></a>
@@ -3200,6 +3200,11 @@ data block is obtained and freed within this function, using memory management
 functions from the match context, if provided, or else those that were used to
 allocate memory for the compiled code.
 .P
+If an external \fImatch_data\fP block is provided, its contents afterwards 
+are those set by the final call to \fBpcre2_match()\fP, which will have
+ended in a matching error. The contents of the ovector within the match data 
+block may or may not have been changed.
+.P
 The \fIoutlengthptr\fP argument must point to a variable that contains the
 length, in code units, of the output buffer. If the function is successful, the
 value is updated to contain the length of the new string, excluding the
@@ -3665,6 +3670,6 @@ Cambridge, England.
 .rs
 .sp
 .nf
-Last updated: 03 August 2018
+Last updated: 07 September 2018
 Copyright (c) 1997-2018 University of Cambridge.
 .fi