(ccclxxi) stackoverflow perl report

These are the ten most rated questions at Stack Overflow last week.
Between brackets: [question score / answers count]
Build date: 2018-12-15 14:35:25 GMT

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1. How to use negative lookbehind with quantifiers? - [4/2]
2. printf: how to align numbers on decimal point - [4/1]
3. How to use Excel::Writer::XLSX to create a table where inserting a row copies a column's formula? - [4/1]
4. Perl timeout command in windows and linux - [4/1]
5. Why are leading-hyphen options permitted on `use` lines without fat comma and with strict? - [3/2]
6. Perl: Why can you use @ or $ when accessing a specific element in an array? - [2/3]
7. How to protect Perl source code using encryption - [2/2]
8. Multi-line regex should match multiple times in a file (one-line command if possible) - [2/2]
9. sub sample an array with an index array - [2/1]
10. How can i install two different version perl on my linux? - [2/1]