/[pcre]/code/trunk/doc/pcreapi.3
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revision 138 by ph10, Tue Mar 20 11:46:50 2007 UTC revision 139 by ph10, Fri Mar 30 13:41:47 2007 UTC
# Line 729  bytes is created. Line 729  bytes is created.
729  .SH "LOCALE SUPPORT"  .SH "LOCALE SUPPORT"
730  .rs  .rs
731  .sp  .sp
732  PCRE handles caseless matching, and determines whether characters are letters  PCRE handles caseless matching, and determines whether characters are letters,
733  digits, or whatever, by reference to a set of tables, indexed by character  digits, or whatever, by reference to a set of tables, indexed by character
734  value. When running in UTF-8 mode, this applies only to characters with codes  value. When running in UTF-8 mode, this applies only to characters with codes
735  less than 128. Higher-valued codes never match escapes such as \ew or \ed, but  less than 128. Higher-valued codes never match escapes such as \ew or \ed, but
736  can be tested with \ep if PCRE is built with Unicode character property  can be tested with \ep if PCRE is built with Unicode character property
737  support. The use of locales with Unicode is discouraged.  support. The use of locales with Unicode is discouraged. If you are handling
738  .P  characters with codes greater than 128, you should either use UTF-8 and
739  An internal set of tables is created in the default C locale when PCRE is  Unicode, or use locales, but not try to mix the two.
740  built. This is used when the final argument of \fBpcre_compile()\fP is NULL,  .P
741  and is sufficient for many applications. An alternative set of tables can,  PCRE contains an internal set of tables that are used when the final argument
742  however, be supplied. These may be created in a different locale from the  of \fBpcre_compile()\fP is NULL. These are sufficient for many applications.
743  default. As more and more applications change to using Unicode, the need for  Normally, the internal tables recognize only ASCII characters. However, when
744  this locale support is expected to die away.  PCRE is built, it is possible to cause the internal tables to be rebuilt in the
745    default "C" locale of the local system, which may cause them to be different.
746    .P
747    The internal tables can always be overridden by tables supplied by the
748    application that calls PCRE. These may be created in a different locale from
749    the default. As more and more applications change to using Unicode, the need
750    for this locale support is expected to die away.
751  .P  .P
752  External tables are built by calling the \fBpcre_maketables()\fP function,  External tables are built by calling the \fBpcre_maketables()\fP function,
753  which has no arguments, in the relevant locale. The result can then be passed  which has no arguments, in the relevant locale. The result can then be passed
# Line 754  the following code could be used: Line 760  the following code could be used:
760    tables = pcre_maketables();    tables = pcre_maketables();
761    re = pcre_compile(..., tables);    re = pcre_compile(..., tables);
762  .sp  .sp
763    The locale name "fr_FR" is used on Linux and other Unix-like systems; if you
764    are using Windows, the name for the French locale is "french".
765    .P
766  When \fBpcre_maketables()\fP runs, the tables are built in memory that is  When \fBpcre_maketables()\fP runs, the tables are built in memory that is
767  obtained via \fBpcre_malloc\fP. It is the caller's responsibility to ensure  obtained via \fBpcre_malloc\fP. It is the caller's responsibility to ensure
768  that the memory containing the tables remains available for as long as it is  that the memory containing the tables remains available for as long as it is
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