diff --git a/electrum/payment_identifier.py b/electrum/payment_identifier.py
index 4fac9ad92..198bb68a1 100644
--- a/electrum/payment_identifier.py
+++ b/electrum/payment_identifier.py
@@ -62,8 +62,8 @@ def maybe_extract_url_from_lud_17_uri(data: str) -> Optional[str]:
 
 
 RE_ALIAS = r'(.*?)\s*\<([0-9A-Za-z]{1,})\>'
-RE_EMAIL = r'\b[A-Za-z0-9._%+-]+@([A-Za-z0-9-]+\.)+[A-Z|a-z]{2,7}\b'
-RE_DOMAIN = r'\b([A-Za-z0-9-]+\.)+[A-Z|a-z]{2,7}\b'
+RE_EMAIL = r'\b[A-Za-z0-9._%+-]+@([A-Za-z0-9-]+\.)+[A-Za-z]{2,7}\b'
+RE_DOMAIN = r'\b([A-Za-z0-9-]+\.)+[A-Za-z]{2,7}\b'
 RE_SCRIPT_FN = r'script\((.*)\)'