diff --git a/srcs/requirements/nestjs/api_back/src/chat/chat.controller.ts b/srcs/requirements/nestjs/api_back/src/chat/chat.controller.ts
index 1a0a508b..65ec9c97 100644
--- a/srcs/requirements/nestjs/api_back/src/chat/chat.controller.ts
+++ b/srcs/requirements/nestjs/api_back/src/chat/chat.controller.ts
@@ -19,7 +19,26 @@ export class ChatController {
 		private chatGateway: ChatGateway,
 	)
 	{
-		this.allowed_chars = "#!?-_";
+		this.allowed_chars = '-#!?_';
+		/*
+		let text = "The best things in life are-* free";
+
+		function escape_chars(str)
+		{
+		  return new_str = str.split("").join("\\");
+		}
+
+		let allowed_chars = '#!?\\-_';
+		let regex_base = `[a-zA-Z0-9\\s${allowed_chars}]`;
+		let test_regex = new RegExp(`^${regex_base}+$`);
+
+		let result = "";
+		result = escape_chars(allowed_chars);
+		//if (test_regex.test(text) === false)
+		//  result = text.replace(new RegExp(regex_base, "g"), "");
+
+		document.getElementById("demo").innerHTML = "[" + result + "]";
+		*/
 	}