diff --git a/validation/excel_validator.py b/validation/excel_validator.py
index 59ed842..bc51755 100644
--- a/validation/excel_validator.py
+++ b/validation/excel_validator.py
@@ -532,7 +532,7 @@ def is_valid_history(value, validation_conf=None):
     try:
         items = [i.strip() for i in value.split("<")]
         for i in items:   
-           regex1 = r'^[a-zA-Z0-9 &,;.:''-]+,?\s*((19|20)\d{2})'
+            regex1 = r'^[a-zA-Z0-9 &,;.:''-]+,?\s*((19|20)\d{2})'
             regex2 =  r'^[a-zA-Z0-9 &,;.:''-]+,?\s*[a-zA-Z0-9 &,;.''-] (19|20)\d{2}\s\([a-zA-Z0-9 &,;.''-:]+\)'
             regex3 = r'^[a-zA-Z0-9 &,;.:''-]+\,?\s*[a-zA-Z0-9 &,;.''-]'
             regex4 = r'^[a-zA-Z0-9 &,;.''-]+,?\s*(19|20)\d{2}\s\([a-zA-Z0-9 .''-,;&:]+\)'