read-regexp

[Eli Zaretskii]

This function accepts an optional argument DEFAULT, but it does not
add its value to the list of defaults it passes to
read-from-minibuffer.  Is that intentional, and if so, what is the
reason for this behavior?

Also, it sounds like DEFAULT must be a single string or nil, it cannot
be a list of strings, as in other functions that read from the
minibuffer.  Again, is that on purpose?

(Btw, it would be good if the doc string gave answers to these
questions.)

TIA