GNU gettext utilities: perl-format
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15.3.23 Perl Format Strings
There are two kinds of format strings in Perl: those acceptable to the Perl built-in function printf, labelled as ‘perl-format’, and those acceptable to the libintl-perl function __x, labelled as ‘perl-brace-format’.
Perl printf format strings are described in the sprintf section of ‘man perlfunc’.
Perl brace format strings are described in the Locale::TextDomain(3pm) manual page of the CPAN package libintl-perl. In brief, Perl format uses placeholders put between braces (‘{’ and ‘}’). The placeholder must have the syntax of simple identifiers.
