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Which one is this: a serious expression of concern or some kind of a lightbulb joke?

Pretty sure it's a reference to this famous[1] joke:

>> Some people, when confronted with a problem, think “I know, I'll use regular expressions.” Now they have two problems.

[1] http://regex.info/blog/2006-09-15/247

The correct response to that saying is to point out that regular expressions are significantly simpler than general-purpose, Turing-complete programming languages.

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