/[pcre]/code/tags/pcre-5.0/doc/pcreapi.3
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revision 65 by nigel, Sat Feb 24 21:40:08 2007 UTC revision 71 by nigel, Sat Feb 24 21:40:24 2007 UTC
# Line 371  in the main Line 371  in the main
371  .\"  .\"
372  page.  page.
373    
374      PCRE_NO_UTF8_CHECK
375    
376    When PCRE_UTF8 is set, the validity of the pattern as a UTF-8 string is
377    automatically checked. If an invalid UTF-8 sequence of bytes is found,
378    \fBpcre_compile()\fR returns an error. If you already know that your pattern is
379    valid, and you want to skip this check for performance reasons, you can set the
380    PCRE_NO_UTF8_CHECK option. When it is set, the effect of passing an invalid
381    UTF-8 string as a pattern is undefined. It may cause your program to crash.
382    Note that there is a similar option for suppressing the checking of subject
383    strings passed to \fBpcre_exec()\fR.
384    
385    
386  .SH STUDYING A PATTERN  .SH STUDYING A PATTERN
387  .rs  .rs
388  .sp  .sp
# Line 698  first matching position. However, if a p Line 710  first matching position. However, if a p
710  or turned out to be anchored by virtue of its contents, it cannot be made  or turned out to be anchored by virtue of its contents, it cannot be made
711  unachored at matching time.  unachored at matching time.
712    
713    When PCRE_UTF8 was set at compile time, the validity of the subject as a UTF-8
714    string is automatically checked. If an invalid UTF-8 sequence of bytes is
715    found, \fBpcre_exec()\fR returns the error PCRE_ERROR_BADUTF8. If you already
716    know that your subject is valid, and you want to skip this check for
717    performance reasons, you can set the PCRE_NO_UTF8_CHECK option when calling
718    \fBpcre_exec()\fR. When this option is set, the effect of passing an invalid
719    UTF-8 string as a subject is undefined. It may cause your program to crash.
720    
721  There are also three further options that can be set only at matching time:  There are also three further options that can be set only at matching time:
722    
723    PCRE_NOTBOL    PCRE_NOTBOL
# Line 872  This error is never generated by \fBpcre Line 892  This error is never generated by \fBpcre
892  use by callout functions that want to yield a distinctive error code. See the  use by callout functions that want to yield a distinctive error code. See the
893  \fBpcrecallout\fR documentation for details.  \fBpcrecallout\fR documentation for details.
894    
895      PCRE_ERROR_BADUTF8       (-10)
896    
897    A string that contains an invalid UTF-8 byte sequence was passed as a subject.
898    
899  .SH EXTRACTING CAPTURED SUBSTRINGS BY NUMBER  .SH EXTRACTING CAPTURED SUBSTRINGS BY NUMBER
900  .rs  .rs
901  .sp  .sp
# Line 1011  then call \fIpcre_copy_substring()\fR or Line 1035  then call \fIpcre_copy_substring()\fR or
1035  appropriate.  appropriate.
1036    
1037  .in 0  .in 0
1038  Last updated: 03 February 2003  Last updated: 20 August 2003
1039  .br  .br
1040  Copyright (c) 1997-2003 University of Cambridge.  Copyright (c) 1997-2003 University of Cambridge.
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