Ruby Quiz #1 - Bonus - Three More Difficulty Levels (2, 3, 4) - Commas Inside Quotes and Double Up Quotes in Quotes, ...

Hello,

    Thanks for the first three entries - all passing the level 1 test. Yay!

    If that was too easy :-)  I added three more difficulty levels
  to the challenge.[1]
.

### Level 2 - Commas Inside Quotes and Double Up Quotes in Quotes

Let's turn Shakespeare's "literal" Hamlet quote:

```
Hamlet says, "Seems," madam! Nay it is; I know not "seems."
```

into

```
1, "Hamlet says, ""Seems,"" madam! Nay it is; I know not ""seems."""
```

And the test reads:

``` ruby
def test_parse_level2
  records = [["1", "Hamlet says, \"Seems,\" madam! Nay it is; I know
not \"seems.\""]]

  assert_equal records, parse( <<TXT )
1, "Hamlet says, ""Seems,"" madam! Nay it is; I know not ""seems."""
TXT
end
```


### Level 3 - Unix/Ruby-Style Backslash Escapes

Lets add the "unix-style" escaping with backslashes (e.g. `\"` for `""`)
used by Ruby :-), PostgreSQL, MySQL and others
(when exporting database tables in CSV, for example):

```
1, "Hamlet says, \"Seems,\" madam! Nay it is; I know not \"seems.\""
```

And the test reads:

``` ruby
def test_parse_level3
  records = [["1", "Hamlet says, \"Seems,\" madam! Nay it is; I know
not \"seems.\""]]

  assert_equal records, parse( <<TXT )
1, "Hamlet says, \\"Seems,\\" madam! Nay it is; I know not \\"seems.\\""
TXT
end
```



### Level 4 - Single or Double? Mixed Quotes

Let's again get inspired by Ruby :-) -
see 210 Ways to Rome [2] and lets add single or double quotes.

```
1, "Hamlet says, 'Seems,' madam! Nay it is; I know not 'seems.'"
2, 'Hamlet says, "Seems," madam! Nay it is; I know not "seems."'
```

And the test reads:

``` ruby
def test_parse_level4
  records = [[1, "Hamlet says, 'Seems,' madam! Nay it is; I know not 'seems.'"],
             [2, 'Hamlet says, "Seems," madam! Nay it is; I know not "seems."']]

  assert_equal records, parse( <<TXT )
1, "Hamlet says, 'Seems,' madam! Nay it is; I know not 'seems.'"
2, 'Hamlet says, "Seems," madam! Nay it is; I know not "seems."'
TXT
end
```


Happy hacking and data wrangling with Ruby.

[1] https://github.com/planetruby/quiz
[2] https://idiosyncratic-ruby.com/15-207-ways-to-rome.html

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