Changed lesson 17 #4
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Improved lesson 17 for clarity
The original task asked for "a word character followed by a digit", which correctly translates to \w\d. However, since \w includes digits, it also matches strings like "12", which caused confusion because "12" shouldn't match if the intent is to start with a letter.
To avoid this ambiguity and make the lesson more beginner-friendly, I changed the task to "whitespace followed by a digit", using \s\d, which demonstrates two shorthand character classes more clearly and avoids conflicting edge cases.