Fundamentals of Perl
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11.12. Quantifiers on character classes

Regex: /-[abc]-/
Input: "-a-"   OK
Input: "-b-"   OK
Input: "-x-"
Input: "-ab-"

Regex: /-[abc]+-/
Input: "-a-"   OK
Input: "-b-"   OK
Input: "-ab-"  OK
Input: "-aa-"  OK
Input: "-x-"

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