Search for %(command) in Help?

I cannot format a help search that looks for %(command), %((...)) or even the expression "Numeric variable expressions".

The parentheses and the percents get removed from the search. I tried both ^ and \ as escape characters but that didn't make any difference. And the radio button for any search words vs all search words didn't make any difference.

I know in a Google search, if you quote the search expression it will search for that exact combination of terms. Since the exact...

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