The caret must immediately follow the or else it stands for just itself. Understanding and writing regular expressions is beyond the scope of this article. To match any character except a list of excluded characters, put the excluded charaters between and. Run the application and see the UserName field is work as expected. A regular expression is widely used in almost platforms from programming languages to databases including MySQL. Also, notice that we are using a verbatim literal symbol) string, as we donвЂ™t want escape sequences to be processed. The Regular Expression Attribute is great for pattern matching and ensures that the value for the UserName property is in the format that we want. Notice that, we are passing regular expression string to the attribute constructor.

In the Employee.cs class file, decorate the UserName property with the RegularExpression attribute as shown below. This requirement can achieve very easily in ASP.NET MVC using RegularExpressionAttribute. Only upper and lower case alphabets are allowed.If the last name is not present, then there shouldnвЂ™t be any space after the first name. The basic method for applying a regular expression is to use the pattern binding operators and. The syntax of regular expressions in Perl is very similar to what you will find within other regular expression.supporting programs, such as sed, grep, and awk. UserName can contain the first and last names with a single space. A regular expression is a string of characters that defines the pattern or patterns you are viewing.Here is the requirement for validating Name property When a user tries to enter an invalid Email ID and submit the page, then he will get the validation error message as shown below: In the above example, we are applying both Required and RegularExpression attributes to the EmailID model property which ensures that the Email Id is a required field and along with it will validate the email id field value as shown below. Suppose, we need to validate the Email ID of an employee, then we can achieve this very easily in the ASP.NET MVC application by using Regular expression attributes as shown below: LetвЂ™s understand the Regular expression attribute with an example. The Regular Expression Attribute is generally used for pattern matching validations in ASP.NET MVC applications. What is Regular Expression Attribute in ASP.NET MVC? At the end of this article, you will understand what are Regular Expression Attribute and how and when to use Regular Expression Attribute in ASP.NET MVC application with examples. Please read our previous article where we discussed Required and StringLength Attribute in ASP.NET MVC application. In this article, I am going to discuss the Regular Expression Attribute in ASP.NET MVC application with examples. Regular Expression Attribute in ASP.NET MVC Data Structures and Algorithms Tutorials.

Regular expression not value