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    Regular expression for validating numbers in asp net

    Step 4 After adding the project "Regular Expression1" you will see the following code in the "Program.cs" file and for creation of the regex add the namespace: using System. Regular Expressions; Step 5 Now write the following code in the file to create the regex.

    In this chapter, you learn how to use the Validation Web controls to validate the information that a user enters into an HTML form.

    The Validation controls make use of a Java Script script library that is automatically installed on your server when you install the . Unfortunately, however, it also prevents all the ASP.

    NET controls on the page from rendering any non-HTML 3.2 compatible content.

    In this article you will see the syntax of Regular Expressions with examples and how to create our own Regular Expression in a C# Console Application with examples of Mobile Number regular expressions.

    Regular Expression Regular expressions are a pattern matching standard for string parsing and replacement and is a way for a computer user to express how a computer program should look for a specified pattern in text and then what the program is to do when each pattern match is found. They are a powerful way to find and replace strings that take a defined format.

    When the user presses Enter, than java Script checks that phone number is valid or not.

    If the number is valid then alert message will be displayed as ‘Phone number is valid’.

    property, you can use this property to disable client-side scripts for particular validation controls or for all validation controls.

    A regular expression can easily check whether a user entered something that looks like a valid phone number.

    Regular expressions are patterns used to match character combinations in strings.

    You can use the Validation controls to perform very different types of form validation tasks.

    For example, you can use the Validation controls to check whether a form field has a value, check whether the data in a form field falls in a certain range, or check whether a form field contains a valid e-mail address or phone number. Even if you need to perform a very specialized form validation task, you can do so by using this control.

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