Update app.py

app.py

@@ -1,4 +1,5 @@
 import os
+import re
 import json
 import copy
 import gradio as gr
@@ -30,6 +31,12 @@ chl_file = open("channels.txt", "r")
 channels = chl_file.read().split("\n")
 channel_btns = []
 
+def get_placeholders(text):
+    """Returns all substrings in between <placeholder> and </placeholder>."""
+    pattern = r"\[([^\]]*)\]"
+    matches = re.findall(pattern, text)
+    return matches
+
 def fill_up_placeholders(txt):
     placeholders = get_placeholders(txt)
     highlighted_txt = txt