Modified regular expression (#5306)

Modified regular expression to add support of unicode's characters and
simplify code

Co-authored-by: Logan Adams <114770087+loadams@users.noreply.github.com>

deepspeed/autotuning/utils.py

@@ -42,7 +42,7 @@ def find_replace_str(value, replace_dict):
     if not isinstance(value, str):
         return str(value)
 
-    matches = re.findall(r"\$[A-Za-z0-9_]+", value)
+    matches = re.findall(r"\$[\w]+", value)
     for var in matches:
         var_key = var.replace("$", "").lower()
         if var_key == "nvme_path":