block certain words using validation regex

[joe_john]

This is kind of related to the question from yesterday, on how to block urls in the phone number field 

 

I was given this code:

 

 

/^([\d\.()\:\- ]+)(ext(ension)?:\s+\d+)?$/i

 

which is good, but it's not liberal enough. I looked at past submissions, and people are entering some weird things. for example, instead of extension, they entered @ext  which would get rejected if I implement the above code. 

 

my goal is to be as liberal as possible, so I think instead of allowing certain characters and disallowing everything else, I should allow everything and disallow just certain characters

 

I want to block

http  

//

www

 .com  

.net

.info

.org

 

if someone puts any of these strings in the phone number field and presses submit, the form should not get submitted. 

 

Can I do this? 

[requinix]

Except for the extensions, the basic rule would be "digits, symbols, and spaces", right? Then the extension might have "e" or "ext" or "extension" or whatever, followed by more numbers.

^[\d.-() ]+([extension]+\d+)$

Doesn't allow slashes, doesn't allow letters not found in the word "extension" and even those have to be followed by just digits.