Module should use OptRegexp for regex pattern option

Instead of using OptString, OptRegexp should be used because this
datastore option is a regex pattern.

Author: wchen-r7

modules/auxiliary/scanner/http/scraper.rb

@@ -29,7 +29,7 @@ def initialize
 		register_options(
 			[
 				OptString.new('PATH', [ true,  "The test path to the page to analize", '/']),
-				OptString.new('REGEX', [ true,  "The regex to use (default regex is a sample to grab page title)", '\<title\>(.*)\<\/title\>']),
+				OptRegexp.new('REGEX', [ true,  "The regex to use (default regex is a sample to grab page title)", '\<title\>(.*)\<\/title\>'])
 
 			], self.class)
 
@@ -57,8 +57,6 @@ def run_host(target_host)
 				return
 			end
 
-			aregex = Regexp.new(datastore['REGEX'].to_s,Regexp::IGNORECASE)
-
 			result = res.body.scan(aregex).flatten.map{ |s| s.strip }.uniq
 
 			result.each do |u|