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Most languages support multi-line block (a.k.a. stream) and/or single line comments. A block comment is delimited with text that marks the start and end of comment text. It can span multiple lines or occupy any part of a line. Some languages allow block comments to be recursively nested inside one another, but others do not.
VSdocman is an extension for Visual Studio 2022, 2019 and 2017. It consists of two main parts - documentation compiler and comment editor. The compiler produces the final class documentation in various formats. The comment editor provides tools for semi-automatic inserting or editing the XML comments that are used by the compiler. [1]
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
Perl::Critic – A tool to help enforce common Perl best practices. Most best practices are based on Damian Conway's Perl Best Practices book. PerlTidy – Program that acts as a syntax checker and tester/enforcer for coding practices in Perl. Padre – An IDE for Perl that also provides static code analysis to check for common beginner errors.
#!/usr/bin/perl – called the "shebang line", after the hash symbol (#) and ! (bang) at the beginning of the line. It is also known as the interpreter directive. # – the number sign, also called the hash symbol. In Perl, the # indicates the start of a comment. It instructs perl to ignore the rest of the line and not execute it as script code.
Regular languages are a category of languages (sometimes termed Chomsky Type 3) which can be matched by a state machine (more specifically, by a deterministic finite automaton or a nondeterministic finite automaton) constructed from a regular expression.
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 ...
As of 2010, the standard module is generally regarded as deprecated; [2] often recommended libraries are pcre (with full support for PCRE) and re (which is not as complete but claims better performance and provides frontends to popular syntaxes: PCRE, Perl, Posix, Emacs, shell globbing). Perl: Perl.com