Positive Lookahead - missing white space in description.

[Githiora]

In section 4.1: Positive Lookahead the regex is specified as:

(T|t)he(?=\sfat)

which includes the "\s" for a white space. However in the explanation it states:

In parentheses we define a positive lookahead which tells the regular expression engine to match The or the only if it's followed by the word fat.

Problem: Explanation is missing mention of the white space.

Solution: Explanation should indicate that the regex requires a whitespace.