# File lib/rake.rb, line 1123
1123:     def calculate_exclude_regexp
1124:       ignores = []
1125:       @exclude_patterns.each do |pat|
1126:         case pat
1127:         when Regexp
1128:           ignores << pat
1129:         when /[*.]/
1130:           Dir[pat].each do |p| ignores << p end
1131:         else
1132:           ignores << Regexp.quote(pat)
1133:         end
1134:       end
1135:       if ignores.empty?
1136:         @exclude_re = /^$/
1137:       else
1138:         re_str = ignores.collect { |p| "(" + p.to_s + ")" }.join("|")
1139:         @exclude_re = Regexp.new(re_str)
1140:       end
1141:     end