Some useful regular expressions

Email regex:

[a-zA-Z0-9._-]+@(([a-zA-Z0-9_-]{2,99}\.)+[a-zA-Z]{2,4})|((25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])\.
(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9]))  

URL regex:

[a-zA-Z]{3,4}[sS]?://((([\w\d\-]+\.)+[ a-zA-Z]{2,4})|((25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])\.
(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])\.
(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])))((\?|/)[\w/=+#_~&:;%\-\?\.]*)  

IP reg exp:

(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])\.
(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[1-9])