lib/regexp-examples/parser.rb in regexp-examples-1.0.0 vs lib/regexp-examples/parser.rb in regexp-examples-1.0.1

@@ -97,25 +97,26 @@
         group = parse_single_char_group( parse_escape_sequence($1) )
       when rest_of_string =~ /\Au(\h{4}|\{\h{1,4}\})/ # Unicode sequence
         @current_position += $1.length
         sequence = $1.match(/\h{1,4}/)[0] # Strip off "{" and "}"
         group = parse_single_char_group( parse_unicode_sequence(sequence) )
-      when rest_of_string =~ /\Ap\{(\^?)([^}]+)\}/ # Named properties
-        @current_position += ($1.length + $2.length + 2)
+      when rest_of_string =~ /\A(p)\{(\^?)([^}]+)\}/i # Named properties
+        @current_position += ($2.length + $3.length + 2)
+        is_negative = ($1 == "P") ^ ($2 == "^") # Beware of double negatives! E.g. /\P{^Space}/
         group = CharGroup.new(
-          if($1 == "^")
-            CharSets::Any.dup - NamedPropertyCharMap[$2.downcase]
+          if is_negative
+            CharSets::Any.dup - NamedPropertyCharMap[$3.downcase]
           else
-            NamedPropertyCharMap[$2.downcase]
+            NamedPropertyCharMap[$3.downcase]
           end,
           @ignorecase
         )
       when next_char == 'K' # Keep (special lookbehind that CAN be supported safely!)
         group = PlaceHolderGroup.new
       when next_char == 'R' # Linebreak
         group = CharGroup.new(["\r\n", "\n", "\v", "\f", "\r"], @ignorecase) # A bit hacky...
       when next_char == 'g' # Subexpression call
-        raise IllegalSyntaxError, "Subexpression calls (\g) are not yet supported"
+        raise IllegalSyntaxError, "Subexpression calls (\\g) cannot be supported, as they are not regular"
       when next_char =~ /[bB]/ # Anchors
         raise IllegalSyntaxError, "Anchors ('\\#{next_char}') cannot be supported, as they are not regular"
       when next_char =~ /[AG]/ # Start of string
         if @current_position == 1
           group = PlaceHolderGroup.new