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Whitespace and newlines in regexps?

For some reason (one of them my lameness) I get extremely confused when it comes whitespace and newlines in regexps.

Say for example that I want to search for an equal sign followed by any number of whitespace and newline characters.

At certain points in time I have done the following in the belief that these regexps are equivalent:

"=[\s\n]" "=[\s-\n]" "=[\s]" "=[\s-]" "=\s*" "=\s-*"

They are not.

The emacs regexp docs just manage to confuse me on this one. :-(

Cheers /Joakim