Steps to reproduce:

    vim -u NONE -N -c ':h /\%(\)'

. This will produce two “E55: Unmatched \)” messages and one “E149: Sorry, no 
help for /\%(\)”. Note that there is such tag. Trying to use “:h /\%(” works.

According to “:h {subject}” ({subject} should be typed literally) (which points 
to the help of “:h {subject}”, {subject} is meant to be a placeholder) 
{subject} may contain “*”, “[]” and “?” that have special meaning, but not a 
single word about “\)” having special meaning as well. It is even explicitely 
suggested to use :tag in a help window to use regexes.

Checked with vim-9999 (vim 7.4b, patches 1-10).

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