In case it was not clear from previous posts, your regex was fine, but you matched and then did nothing. You needed to print the match. So your regex: 
m/\bDE\d+/g

[download]
would match and stop. What they did (in addition to being more specific with the number of digits) is to group your match in parentheses: 
m/\b(DE\d+)/g

[download]
And then the match is located in $1. (Which they print)

In reply to Re: Parsing web pages (sort of) by swiftone
in thread Parsing web pages (sort of) by MrDoney

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