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operators - What does =~ do in Perl? - Stack Overflow
14 The '=~' operator is a binary binding operator that indicates the following operation will search or modify the scalar on the left. The default (unspecified) operator is 'm' for match. The matching operator has a pair of characters that designate where the regular expression begins and ends. Most commonly, this is '//'. Give Perl Re tutorial ...

What is the meaning of @_ in Perl? - Stack Overflow
128 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 @_ .

operators - What is the difference between "||" and "or" in Perl ...
53 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.

What's the use of <> in Perl? - Stack Overflow
@pst, <> is not a file handle, "null" or otherwise. It's an operator. Specifically, the readline operator. There's a reference to it as the "angle operator" in perlvar, although there isn't actually any such operator. The angle brackets are used by two operators: readline or glob. The operator depends on the contents of the brackets.

operators - What does =~ mean in Perl? - Stack Overflow
Possible Duplicate: What does =~ do in Perl? In a Perl program I am examining (namly plutil.pl), I see a lot of =~ on the XML parser portion. For example, here is UnfixXMLString (lines 159 to 167 ...

oop - How do you create objects in Perl? - Stack Overflow
Perl has OOP features, but they are somewhat rarely used. How do you create and use Perl objects with methods and properties?

dictionary - How can I combine hashes in Perl? - Stack Overflow
Overview Context: Perl 5.x Problem: The user wishes to merge two hashes 1 into a single variable Solution use the syntax above for simple variables use Hash::Merge for complex nested variables Pitfalls What do to when both hashes contain one or more duplicate keys (see e.g., Perl - Merge hash containing duplicate keys)

How do you round a floating point number in Perl?
In 5.000 to 5.003 perls, trigonometry was done in the Math::Complex module. With 5.004, the Math::Trig module (part of the standard Perl distribution) implements the trigonometric functions. Internally it uses the Math::Complex module and some functions can break out from the real axis into the complex plane, for example the inverse sine of 2.

perl - Regex to match any character including new lines - Stack Overflow
Perl v5.12 added the \N as a character class shortcut to always match any character except a newline despite the setting of /s. This allows \n to have a partner like \s has \S.

How can I parse command-line arguments in a Perl program?
I'm working on a Perl script. How can I parse command line parameters given to it? Example: script.pl "string1" "string2"