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.\"
.IX Title "locale 3"
.TH locale 3 "2014-10-01" "perl v5.18.4" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
locale \- Perl pragma to use or avoid POSIX locales for built\-in operations
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 6
\& @x = sort @y; # Unicode sorting order
\& {
\& use locale;
\& @x = sort @y; # Locale\-defined sorting order
\& }
\& @x = sort @y; # Unicode sorting order again
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This pragma tells the compiler to enable (or disable) the use of \s-1POSIX\s0
locales for built-in operations (for example, \s-1LC_CTYPE\s0 for regular
expressions, \s-1LC_COLLATE\s0 for string comparison, and \s-1LC_NUMERIC\s0 for number
formatting). Each \*(L"use locale\*(R" or \*(L"no locale\*(R"
affects statements to the end of the enclosing \s-1BLOCK.\s0
.PP
Starting in Perl 5.16, a hybrid mode for this pragma is available,
.PP
.Vb 1
\& use locale \*(Aq:not_characters\*(Aq;
.Ve
.PP
which enables only the portions of locales that don't affect the character
set (that is, all except \s-1LC_COLLATE\s0 and \s-1LC_CTYPE\s0). This is useful when mixing
Unicode and locales, including \s-1UTF\-8\s0 locales.
.PP
.Vb 9
\& use locale \*(Aq:not_characters\*(Aq;
\& use open ":locale"; # Convert I/O to/from Unicode
\& use POSIX qw(locale_h); # Import the LC_ALL constant
\& setlocale(LC_ALL, ""); # Required for the next statement
\& # to take effect
\& printf "%.2f\en", 12345.67\*(Aq # Locale\-defined formatting
\& @x = sort @y; # Unicode\-defined sorting order.
\& # (Note that you will get better
\& # results using Unicode::Collate.)
.Ve
.PP
See perllocale for more detailed information on how Perl supports
locales.
.SH "NOTE"
.IX Header "NOTE"
If your system does not support locales, then loading this module will
cause the program to die with a message:
.PP
.Vb 2
\& "Your vendor does not support locales, you cannot use the locale
\& module."
.Ve