Re: Invalid search bound (wrong side of point)

[Richard Stallman]

    `perform-replace' uses nil value returned from `re-search-forward'
    as a condition to terminate the loop, but when the value of point
    becomes greater than limit, "Invalid search bound" error is signalled,
    even though `noerror' argument of `re-search-forward' is t.

I think that is correct behavior.  Invalid arguments are a different
matter from valid arguments but no match.

The clean solution is for perform-replace to detect the situation
explicitly.