Added a live-edit RegEx tester to the demos

demos/misc/regex/engine.cfg

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+[application]
+
+name="RegEx"
+main_scene="res://regex.scn"

demos/misc/regex/regex.gd

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+extends VBoxContainer
+
+var regex = RegEx.new()
+
+func update_expression():
+	regex.compile(get_node("Expression").get_text())
+	update_text()
+
+func update_text():
+	var text = get_node("Text").get_text()
+	regex.match(text)
+	var list = get_node("List")
+	for child in list.get_children():
+		child.queue_free()
+	for res in regex.get_capture_list():
+		var label = Label.new()
+		label.set_text(res)
+		list.add_child(label)
+
+func _ready():
+	get_node("Text").set_text("They asked me \"What's going on \\\"in the manor\\\"?\"")
+	update_expression()