Regular expression for validating web site address
You can use them to constrain input, apply formatting rules, and check lengths. This How To shows how you can use regular expressions within ASP. Objectives Overview Using a Regular Expression Validator Control Using the Regex Class Common Regular Expressions Additional Resources If you make unfounded assumptions about the type, length, format, or range of input, your application is unlikely to be robust.To validate input captured with server controls, you can use the Regular Expression Validator control. Input validation can become a security issue if an attacker discovers that you have made unfounded assumptions. Code can be found at: https://github.com/garycourt/uri-js I changed it a little bit so that it's valid in Ruby. It uses a much larger regular expression then this one. He also sliced up the Unicode ranges :=), that's the reason his one is so long :) = 22.214.171.124/8 are excluded by the second validation block. This a very minimal list of tests to add to your testings: PASS " " " FAIL " " " " " Need testing :) Need to mention I took the idea of validating the possible IP address ranges in the URL while looking at other developers regular expressions I have seen in your tests, especially the one from @scottgonzales.
This How To shows how you can use regular expressions within ASP. Regular expressions are a good way to validate text fields such as names, addresses, phone numbers, and other user information.
If you are running a PHP version older than 5.2 you are out of luck.
There is also a bug in PHP 5.2.13 and PHP 5.3.2 that will not allow URLs with dashes in them to validate.
It is easy to just remove the unwanted parts of the validation to fit different scopes (length, precision) so I will probably add more options like the list of existing TLD (possibly grouped), the list of existing protocols and/or a fall back for a more generic protocol match too. my Java Script URI parsing library does strict URI validation as per RFC 3986.
The second validation block also takes care of excluding IP address terminating with 0 or 255 (non usable network and broadcast addresses of each class C network).
The centerpiece of text processing with regular expressions is the regular expression engine, which is represented by the System. Assume that a mailing list contains names that sometimes include a title (Mr., Mrs., Miss, or Ms.) along with a first and last name. Regular Expressions Module Example Public Sub Main() Dim pattern As String = "(Mr\.?