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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.