diff --git a/README.md b/README.md
index 93a97d3..dfc5af1 100644
--- a/README.md
+++ b/README.md
@@ -181,7 +181,7 @@ Add extra patterns to match. This parameter can have multiple instances.
 For example:
 
 ```
-set -g @thumbs-regexp-1 '[a-z]+@[a-z]+.com' # Match emails
+set -g @thumbs-regexp-1 '[\w-\.]+@([\w-]+\.)+[\w-]{2,4}' # Match emails
 set -g @thumbs-regexp-2 '[a-f0-9]{2}:[a-f0-9]{2}:[a-f0-9]{2}:[a-f0-9]{2}:[a-f0-9]{2}:[a-f0-9]{2}:' # Match MAC addresses
 set -g @thumbs-regexp-3 'Vlan\d+' # match Vlan interface on network devices
 set -g @thumbs-regexp-4 "Vlan\\d+" # alternative method of defining regexp