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I tried to use such rule:
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* Something[[:space:]]+whatever
but it doesn’t work.
When I change [[:space:]] to literal space character:
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* Something +whatever
it works.
It also works in case of:
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* Something[ ]+whatever
I must be doing something wrong, but can’t really find it. Any hints?
What about just adding the white space characters in a class you want to match:
matches a space, tab, carriage return and line feed.
There are of course more white space chars, but these are the most commonly used.