Prefer %w to the literal array syntax when you need an array of strings.

https://github.com/bbatsov/ruby-style-guide#collections
Merge pull request #64 from kbighorse/master

Prefer %w to the literal array syntax when you need an array of strings.
SQL Injection teachers

[ruby regular expressions](https://github.com/bbatsov/ruby-style-guide#regular-expressions)

```ruby
string = "some injection\nusername"
string[/^username$/]   # matches
string[/\Ausername\z/] # don't match
```
Merge pull request #66 from artemeff/patch-1

SQL Injection teachers