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Perl. Block comments in Perl are considered part of the documentation, and are given the name Plain Old Documentation (POD). Technically, Perl does not have a convention for including block comments in source code, but POD is routinely used as a workaround. PHP. PHP supports standard C/C++ style comments, but supports Perl style as well. Python
In some of these languages, this syntax is a here document or "heredoc": A token representing the string is put in the middle of a line of code, but the code continues after the starting token and the string's content doesn't appear until the next line. In other languages, the string's content starts immediately after the starting token and the ...
Perl: Application, scripting, text processing, Web Yes Yes Yes Yes Yes Yes No PHP: Server-side, web application, web Yes Yes [37] Yes [38] Yes No Yes De facto standard via language specification and Requests for Comments (RFCs) PL/I: Application Yes Yes No Yes No No Yes 1969, ECMA-50 (1976) Plus: Application, system development Yes No No Yes No ...
Diagram of the mechanism of using perl modules. A Perl module is a discrete component of software for the Perl programming language.Technically, it is a particular set of conventions for using Perl's package mechanism that has become universally adopted.
A less explicit but more conceptually portable version of this string is ' 0E0 ' or ' 0e0 ', which does not rely on characters being evaluated as 0, because '0E0' is literally zero times ten to the power zero. The empty hash {} is also true; in this context {} is not an empty block, because perl -e 'print ref {}' returns HASH.
C does not provide direct support to exception handling: it is the programmer's responsibility to prevent errors in the first place and test return values from the functions.
Raku rules are the regular expression, string matching and general-purpose parsing facility of the Raku programming language, and are a core part of the language. Since Perl's pattern-matching constructs have exceeded the capabilities of formal regular expressions for some time, Raku documentation refers to them exclusively as regexes, distancing the term from the formal definition.
New say built-in (via feature say) Ability to declare static variables with state; 5.8.1 September 25, 2003 [1] Perl 5.8.1 Release Notes: Improved randomization of hash order, for security reasons. Unicode is not enabled by default based on locale settings. Version strings on the left of a fat comma are treated as string literals.