/[pcre]/code/trunk/doc/pcre.3
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revision 63 by nigel, Sat Feb 24 21:40:03 2007 UTC revision 71 by nigel, Sat Feb 24 21:40:24 2007 UTC
# Line 116  to testing the PCRE_UTF8 flag in several Line 116  to testing the PCRE_UTF8 flag in several
116    
117  The following comments apply when PCRE is running in UTF-8 mode:  The following comments apply when PCRE is running in UTF-8 mode:
118    
119  1. PCRE assumes that the strings it is given contain valid UTF-8 codes. It does  1. When you set the PCRE_UTF8 flag, the strings passed as patterns and subjects
120  not diagnose invalid UTF-8 strings. If you pass invalid UTF-8 strings to PCRE,  are checked for validity on entry to the relevant functions. If an invalid
121  the results are undefined.  UTF-8 string is passed, an error return is given. In some situations, you may
122    already know that your strings are valid, and therefore want to skip these
123    checks in order to improve performance. If you set the PCRE_NO_UTF8_CHECK flag
124    at compile time or at run time, PCRE assumes that the pattern or subject it
125    is given (respectively) contains only valid UTF-8 codes. In this case, it does
126    not diagnose an invalid UTF-8 string. If you pass an invalid UTF-8 string to
127    PCRE when PCRE_NO_UTF8_CHECK is set, the results are undefined. Your program
128    may crash.
129    
130  2. In a pattern, the escape sequence \\x{...}, where the contents of the braces  2. In a pattern, the escape sequence \\x{...}, where the contents of the braces
131  is a string of hexadecimal digits, is interpreted as a UTF-8 character whose  is a string of hexadecimal digits, is interpreted as a UTF-8 character whose
# Line 162  Cambridge CB2 3QG, England. Line 169  Cambridge CB2 3QG, England.
169  Phone: +44 1223 334714  Phone: +44 1223 334714
170    
171  .in 0  .in 0
172  Last updated: 04 February 2003  Last updated: 20 August 2003
173  .br  .br
174  Copyright (c) 1997-2003 University of Cambridge.  Copyright (c) 1997-2003 University of Cambridge.
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