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.IX Title "locale 3perl"
.TH locale 3perl "2023-11-25" "perl v5.36.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
locale \- Perl pragma to use or avoid POSIX locales for built\-in operations
.SH "WARNING"
.IX Header "WARNING"
\&\s-1DO NOT USE\s0 this pragma in scripts that have multiple
threads active.  The locale is not local to a single thread.
Another thread may change the locale at any time, which could cause at a
minimum that a given thread is operating in a locale it isn't expecting
to be in.  On some platforms, segfaults can also occur.  The locale
change need not be explicit; some operations cause perl to change the
locale itself.  You are vulnerable simply by having done a \f(CW"use
locale"\fR.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 7
\&    @x = sort @y;      # Native\-platform/Unicode code point sort order
\&    {
\&        use locale;
\&        @x = sort @y;  # Locale\-defined sort order
\&    }
\&    @x = sort @y;      # Native\-platform/Unicode code point sort 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
See perllocale for more detailed information on how Perl supports
locales.
.PP
On systems that don't have locales, this pragma will cause your operations
to behave as if in the \*(L"C\*(R" locale; attempts to change the locale will fail.