man perlop "perlop - Perl operators and precedence" (at least in UNIX-like) answers this question: "Binary "=~" binds a scalar expression to a pattern match." – U. Windl Commented Apr 1, 2020 at 21:11

Apr 5, 2011 · Here the sigil changes to $ to denote that you are accessing a scalar, however the trailing [0] tells perl that it is accessing a scalar element of the array in _ or in other words, @_. – Eric Strom

Feb 6, 2011 · Perl arrow operator has one other use: Class−>method invokes subroutine method in package Class. though it's completely different than your code sample. Only including it for completeness for the question in the title.

Dec 30, 2010 · perldoc perlvar is the first place to check for any special-named Perl variable info. Quoting: @_: Within a subroutine the array @_ contains the parameters passed to that subroutine. More details can be found in perldoc perlsub (Perl subroutines) linked from the perlvar: Any arguments passed in show up in the array @_.

Feb 2, 2016 · The => operator in perl is basically the same as comma. The only difference is that if there's an unquoted word on the left, it's treated like a quoted word. The only difference is that if there's an unquoted word on the left, it's treated like a quoted word.

Nov 10, 2019 · From Perl documentation:. OR List operators. On the right side of a list operator, it has very low precedence, such that it controls all comma-separated expressions found there.

This is a Perl program, run using a terminal (Windows Command Line). I am trying to create an "if this and this is true, or this and this is true" if statement using the same block of code for both conditions without having to repeat the code.

Jun 5, 2009 · getlines is a Perl file handle built-in method coming from the autoloaded IO::Handle class that allows us to treat file handles as objects. DATA is a special file handle in Perl, but can refer to any other as well.

Jun 21, 2022 · An attempted perl answer to a question about removing substrings - I did not compare speed but =~, index(), ~~ and match::simple all seemed a bit awk-ward ... – G. Cito Commented Feb 25, 2016 at 0:20

Feb 14, 2017 · It's also worth noting that in some programming languages the first (0) argument is the command or script itself... not so in perl though, of course. – danieltalsky Commented Dec 12, 2008 at 5:46