This one returns the following error: 
Invalid [] range "\\/-\\ " in regex; marked by <-- HERE in m/ (?<![\\/
+-\\ <-- HERE \\w]) \\d{4} (?![\\/-\\ \\w]) /

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I'm not really sure what is wrong.

In reply to Re^4: Recognizing 3 and 4 digit number by htmanning
in thread Recognizing 3 and 4 digit number by htmanning

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