(cccvi) stackoverflow perl report

These are the ten most rated questions at Stack Overflow last week.
Between brackets: [question score / answers count]
Build date: 2017-09-16 10:29:46 GMT

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1. What is _ (single underscore) in Perl without $ or @? - [30/2]
2. Creating a new regex based on the returned results and rules of a previous regex | Indexing a regex and seeing how the regex has matched a substring - [17/4]
3. How do I use a default array if no command line arguments are given? - [8/2]
4. Perl comparison operator output - [5/1]
5. A strict regular expression for matching chemical formulae - [4/2]
6. Why does DBD::SQLite have a different query plan for an SQL statement - [4/0]
7. Where is Perl's default object-to-string conversion defined? - [3/3]
8. How can I use an external lib in a BEGIN block - [3/2]
9. How to change the location of perl? - [3/2]
10. regex for strings optionally surrounded with quotes - [3/1]