Hopefully improve expression/variable regex

Previously the variable regex was having trouble with nested expressions, e.g. {Autoload.dictionary[{Player.Name}]}, would get incorrectly split and thus was unable to parse.

addons/dialogic/Editor/TimelineEditor/TextEditor/syntax_highlighter.gd

@@ -179,9 +179,10 @@ func color_region(dict:Dictionary, color:Color, line:String, start:String, end:S
 		end = "\\"+end
 
 	if end.is_empty():
-		region_regex.compile("(?<!\\\\)"+start+".*")
+		region_regex.compile(r"(?<!\\)"+start+".*")
 	else:
-		region_regex.compile("(?<!\\\\)"+start+"((?!"+end+").)*"+end)
+		r"(?<!\\){([^{}]|({[^}]*}))*}"
+		region_regex.compile(r"(?<!\\)"+start+"([^"+start+end+"]|("+start+"[^"+end+"]*"+end+"))*"+end)
 	if to <= from:
 		to = len(line)-1
 	for region in region_regex.search_all(line.substr(from, to-from+2)):

addons/dialogic/Modules/Text/subsystem_text.gd

@@ -87,10 +87,10 @@ func post_install() -> void:
 
 ## Applies modifiers, effects and coloring to the text
 func parse_text(text:String, type:int=TextTypes.DIALOG_TEXT, variables := true, glossary := true, modifiers:= true, effects:= true, color_names:= true) -> String:
-	if modifiers:
-		text = parse_text_modifiers(text, type)
 	if variables and dialogic.has_subsystem('VAR'):
 		text = dialogic.VAR.parse_variables(text)
+	if modifiers:
+		text = parse_text_modifiers(text, type)
 	if effects:
 		text = parse_text_effects(text)
 	if color_names:

addons/dialogic/Modules/Variable/subsystem_variables.gd

@@ -59,7 +59,7 @@ func parse_variables(text:String) -> String:
 
 	# Trying to extract the curly brackets from the text
 	var regex := RegEx.new()
-	regex.compile("(?<!\\\\)\\{(?<variable>([^{}]|\\{.*\\})*)\\}")
+	regex.compile(r"(?<!\\)\{(?<variable>([^{}]|\{[^}]*\})*)\}")
 
 	var parsed := text.replace('\\{', '{')
 	for result in regex.search_all(text):