Regular expression for validating url in c
=.*[a-z]) # must contain one lowercase character (? # From 8 to 10 characters in length \s # allows a space $ # anchor at the end", Regex Options.Ignore Pattern Whitespace); Validates the format, type, and length of the supplied input field.
This page may contain URLs that were valid when originally published, but now link to sites or pages that no longer exist.If you are not using server controls (which means you cannot use the validation controls) or if you need to validate input from sources other than form fields, such as query string parameters or cookies, you can use the Regex class within the System. The following example shows how to use a regular expression to validate a name input through a regular client-side HTML control.Regular expressions are much easier to understand if you use the following syntax and comment each component of the expression by using a number sign (#).A ^ matches the position at the beginning of the input string and a $ matches the position at the end of the input string.If you omit these markers, an attacker could affix malicious input to the beginning or end of valid content and bypass your filter. To use the Regex class For performance reasons, you should use the static Is Match method where possible to avoid unnecessary object creation.To avoid such vulnerability, you should validate text fields (such as names, addresses, tax identification numbers, and so on) and use regular expressions to do the following: Regular expression support is available to ASP. If you capture input by using server controls, you can use the Regular Expression Validator control to validate that input.
NET applications through the Regular Expression Validator control and the Regex class in the System. You can use regular expressions to restrict the range of valid characters, to strip unwanted characters, and to perform length and format checks.
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.
To validate other forms of input, such as query strings, cookies, and HTML control input, you can use the System. The attacker can then supply carefully crafted input that compromises your application by attempting SQL injection, cross-site scripting, and other injection attacks.
Regards, Abhishek when we are u using that time it working fine but that is not only web site ulr format for example ( .com, , , in ) like this lot of format is there .please post answer like all url validation supported ..
I have applied this in one of my projects and its working there. ([a-z A-Z0-9] (\.[a-z A-Z0-9] ) .*)$ Let me know if you face any problem.
Because the logic is already implemented using regexes for validating different types of input data but it does not handles as invalid urls. Is Well Formed Uri String will require some refactoring and I will just fix the reg ex for now.