Regular expression for validating email address asp net Xxlcam sex

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Luckily, Data Annotations attributes are extensible, so we can roll our own! We can apply this technique to any data that can be validated with a regex: post codes, bank sort codes, urls etc.

In this code we define a new attribute which extends the Regular Expression Attribute, passing our regex to its constructor (you can of course pick your email validation regular expression of choice, here is a nice summary). We can now use our new attribute on our model: So now we know how to do it, don’t. Grab the Data Annotations Extensions and use those. The important thing is that you now know how to do this if you want to validate some other data format.

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Let's say you have an feedback web form with few text boxes and button to send a message, like in image bellow: You require valid e-mail from user because otherwise you can't answer to submitted message. NET to check if email is valid would require complex string manipulation.

NET web form, use Regular Expression Validator control. Validation of data that come from other sources (cookies, query strings, web services etc.). Common validation controls, like Required Field Validator, Range Validator or Compare Validator could be used for simple tasks like check for required values, ranges and comparisons. NET validation controls you can read in Validation in ASP. For more complex tasks we need to use Regular Expression Validator control. NET can be performed with client and server side code.

In this case, you can validate data using Regex class from System. Client side validation works faster, since there is no need to send request to server.

You can write expression directly or press small button on right side to get standard expressions, like marked on next image: Now, Validation Expression property is set to \w ([- .']\w )*@\w ([-.]\w )*\.\w ([-.]\w )*.

This expression doesn't work well for empty string or if user writes only spaces.

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