20 best Perl questions at stackoverflow in 2013

This is the 20 most rated questions at Stack Overflow in 2013.
Between brackets: question score & answers count
Built date: 2014/01/01 09:14:04 GMT

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1. Sum of 1 to 1,000,000,000 - [162/36]
2. "vertical" regex matching in an ASCII "image" - [34/6]
3. Perl 5.20 and the fate of SmartMatch and Given/When? - [29/3]
4. "48" appearing in JavaScript code instead of "$(" - [23/3]
5. Perl regex - Is (x|y)* equivalent to [xy]*? - [22/2]
6. Perl: difference between $var = 500 and $var = '500' - [22/10]
7. Is "my" a function in Perl? - [21/2]
8. Spreadsheet::ParseExcel::Stream losing its parser - [20/1]
9. Why does (.*)* make two matches and select nothing in group $1? - [19/1]
10. Should you use '||' or lower precedence 'or' when reporting an error in Perl? - [15/2]
11. What criteria should I use to evaluate a Perl "app server" (mod_perl replacement)? - [15/3]
12. Trying to understand Perl sorting the result of a function - [15/2]
13. Is there any difference between "standard" and block package declaration? - [15/5]
14. How to access groups captured by recursive perl regexes? - [15/2]
15. What are the pros and cons about declaring package version methods in Perl? - [15/3]
16. What is the difference between -> and :: in Perl - [15/3]
17. Forcing a list context in Perl - [14/3]
18. Explain this perl code which displays common lines in 2 files - [14/2]
19. Array element automatically set to undef won't change when aliased? - [14/2]
20. Why is perl so afraid of "deep recursion"? - [14/3]