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If there are no empty fields, then the following code validates the first name by calling the static method Match of the Regex class, passing both the string to validate and the Regular Expression as arguments. This object contains a Success property that indicates whether a method Match's first argument matches the pattern specified by the Regular Expression in the second argument.If the value of Success is false (i.e., there was no match), then it displays an error message and sets the focus back to the first Name Text Box so that the user can retype the input and terminate the event handler.
So yeah, your users are going to skip some fields; enter emails without a ; use weak passwords; and not agree with the Terms of Service… We need to show the users what went wrong when they enter invalid data. What we do, then, is run this function when the form submitted, and if there are errors, we somehow reflect that in the UI. So imagine we have a sign up form, with three fields: name, email, and password.This article explains how to use Regex in a Windows application.The code example uses Regular Expressions in C# to validate name, address, and telephone number input by a user.trait which provides a convenient method to validate incoming HTTP request with a variety of powerful validation rules.To learn about Laravel's powerful validation features, let's look at a complete example of validating a form and displaying the error messages back to the user.