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operators - What does =~ do in Perl? - Stack Overflow 51 I guess the tag is a variable, and it is checking for 9eaf - but does this exist in Perl? What is the "=~" sign doing here and what are the " " characters before and after 9eaf doing?
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 @_
Whats the use of lt; gt; 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
Perl: Use s (replace) and return new string - Stack Overflow In Perl, the operator s is used to replace parts of a string Now s will alter its parameter (the string) in place I would however like to replace parts of a string befor printing it, as in pri
How do I perform a Perl substitution on a string while keeping the . . . In Perl, what is a good way to perform a replacement on a string using a regular expression and store the value in a different variable, without changing the original? I usually just copy the string to a new variable then bind it to the s regex that does the replacement on the new string, but I was wondering if there is a better way to do this?
Should I use \\d or [0-9] to match digits in a Perl regex? Per perldoc perluniintro, Perl does not support using digits other than [0-9] as numbers, so I would definitely use [0-9] if the following are both true: You want to use the result as a number (such as performing mathematical operations on it or storing it somewhere that only accepts proper numbers (e g an INT column in a database))