Useful Regex patterns

In web or desktop application forms reg-ex used to validate form vales. From this post you can find most used reg-exes for validations.
If you want a basic understanding of Reg-ex you can follow this post

Use online reg-ex tester to practice

 

For e-mails

• ^\w[-.\w+&]*\w@\w[-.\w]*[a-zA-Z]{2,3}$ 

This accepts: 
me.myself@mysite.com 
you&me_developers@yoursite.lk 
123steve.me_contact@mysite.edu

 

For Telephone Numbers

• ^\(\d{3}\) ?\d{3}( |-)?\d{4}|^\d{3}( |-)?\d{3}( |-)?\d{4}$

This accepts:
(123)456-7890
1234567890
123-456-7890

For Numbers including Floating points

• ^[-+]?\d*(\.\d+)?$

This accepts:
-20.456 
-.456 

For URLs

• ^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,3}$

This accepts:
www.example.mysite.com
1234-sa5.au


For HTML tags

• </?(\s*"[^"]*")*[^>]*>

 This accepts:
 <img title="displays >>" src="new.jpg">
</br>


For SQL validation

•   /^(UPDATE|SELECT|INSERT INTO)(.*)(;)$/im

 This accepts:
 select * from table1