Search for the expression in a char_array (name or string) or a
text_buffer. The two integers specify the range to search in as [start,
end). This method succeeds if a match is found and fails otherwise.
After a successful search, regex<-register_start, regex<-register_end
and
regex<-register_value
may be used to get information on the location of the match.
If end is smaller than start, the search is
executed backwards. The regex<-search
variant returns the regex<-register_start.
Inherits description from: regex->search
