--- code/trunk/doc/html/pcretest.html	2010/11/16 17:51:37	571
+++ code/trunk/doc/html/pcretest.html	2010/11/17 17:55:57	572
@@ -385,7 +385,8 @@
   \t         tab (\x09)
   \v         vertical tab (\x0b)
   \nnn       octal character (up to 3 octal digits)
-  \xhh       hexadecimal character (up to 2 hex digits)
+               always a byte unless > 255 in UTF-8 mode 
+  \xhh       hexadecimal byte (up to 2 hex digits)
   \x{hh...}  hexadecimal character, any number of digits in UTF-8 mode
   \A         pass the PCRE_ANCHORED option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
   \B         pass the PCRE_NOTBOL option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
@@ -423,6 +424,14 @@
   \&#60;anycrlf&#62; pass the PCRE_NEWLINE_ANYCRLF option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
   \&#60;any&#62;     pass the PCRE_NEWLINE_ANY option to <b>pcre_exec()</b> or <b>pcre_dfa_exec()</b>
 </pre>
+Note that \xhh always specifies one byte, even in UTF-8 mode; this makes it 
+possible to construct invalid UTF-8 sequences for testing purposes. On the 
+other hand, \x{hh} is interpreted as a UTF-8 character in UTF-8 mode,
+generating more than one byte if the value is greater than 127. When not in 
+UTF-8 mode, it generates one byte for values less than 256, and causes an error 
+for greater values.
+</P>
+<P>
 The escapes that specify line ending sequences are literal strings, exactly as
 shown. No more than one newline setting should be present in any data line.
 </P>
@@ -747,7 +756,7 @@
 </P>
 <br><a name="SEC15" href="#TOC1">REVISION</a><br>
 <P>
-Last updated: 06 November 2010
+Last updated: 07 November 2010
 <br>
 Copyright &copy; 1997-2010 University of Cambridge.
 <br>