Re^2: Why does default $

At first glance, it's appears to me as if it's working due to a side effect. chomp operates on $_ implicitly, which you are affecting in your example that works. I do not believe chomp is taking the LHS of the assignment and working with $_ like you think it is. Update - I stand corrected - You can actually chomp anything that's an lvalue, including an assignment:... in chomp. I do think it's related to you using $_ inconsistently when switching to $selection.

For clarity you probably still want:

   my $selection  = <STDIN>;
   chomp ($selection);
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And your regex seems incorrect, as pointed out by LanX. This may be where using $_ originally got you.

Comment on Re^2: Why does default $_ only work Select or Download Code

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Re^3: Why does default $_ only work by haukex (Archbishop) on Aug 10, 2020 at 19:43 UTC
I do not believe chomp is taking the LHS of the assignment and working with it that scalar. No, that's incorrect, chomp does modify its argument and the return value of the assignment `my $selection = <STDIN>` is the lvalue `$selection`, which chomp operates on. The use of chomp in this code is correct and has nothing to do with the problem, it's a `=` vs `=~` problem.	[reply] [d/l] [select]
Re^4: Why does default $_ only work by perlfan (Parson) on Aug 10, 2020 at 19:48 UTC
Yes, corrected this while you were likely replying. I should have confirmed before I sent the original guess. :) Thank you.	[reply]