String.re uses first('regexpMatcher', 'regexpReplacer'). If the args
provided to String.re are not a matcher and are longer than a single IRC
message (e.g., from a nested command), then regexpReplacer would never
be tried. A too long error should be handled the same as running out of
args while trying to find a valid regexp.
Signed-off-by: James McCoy <vega.james@gmail.com>