What would be the regular expression to find the substrings www. and http:// in a domain name.
Basically I am writing an MVC validation to disallow a word that includes
www., http:// or http://www. in it.
Add a comment
|
1 Answer
Try:
Regex.IsMatch(myString, @"(www\.|http://)");
If you want to specify that they aren't allowed at the start of the string, but allow them elsewhere, use:
Regex.IsMatch(myString, @"^(www\.|http://)");
2 Comments
Julian Dormon
I plugged it into the validation and it is returning true no matter what. [RegularExpression(@"(www\.|http://)",ErrorMessage="http:// or www. is not permitted the domain name.")] Any idea? Thanks!
Ant P
This is because you need to then assert in your validation that matches are invalid but the Regex DataAnnotation asserts that matches are valid. Regex is not good at checking that a string "doesn't have a substring" (without horrible lookarounds), so perhaps you could look into implementing a custom validator for
DoesNotMatch? msdn.microsoft.com/en-us/…