bug in Regexp in Chapter 4

[aidancully]

Chapter 4 / Regular Expressions / Don't Work Too Hard introduces the section with the following code:

["James Gray", "James gray", "james gray", "james Gray"].all? { |e| ?> e.match(/James|james Gray|gray/) }

The regex in this example (/James|james Gray|gray/) will match any string containing "James", or "james Gray", or "gray", which is probably not what you intended. That is,

>> "gray".match(/James|james Gray|gray/) && true
=> true
>> "Gray".match(/James|james Gray|gray/) && true
=> nil

Suggest either /(James|james) (Gray|gray)/ or /(?:James|james) (?:Gray|gray), or note that finding the bug is an exercise for the reader.