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The description only talks about punctuation, no intended behavior is specified for numbers (and underscores inside words can hardly be called punctuation either). So \w is prefectly acceptable here, as it's [a-b] due to lack of specification.
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This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution
The description only talks about punctuation, no intended behavior is specified for numbers (and underscores inside words can hardly be called punctuation either). So \w is prefectly acceptable here, as it's [a-b] due to lack of specification.