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Checks for an at (@) sign, dot (.), and only allowed nonwhitespace characters. Any sequence of word characters (letter, space, or underscore). A password that must be at least four characters long but no longer than ten characters. As with the specific-length password, this regular expression will allow four to ten total characters. The twist is that the first character must fall in the range of a z or A Z (that is to say, it must start with a nonaccented ordinary letter). This password starts with a letter character, followed by zero or more word characters, a digit, and then zero or more word characters. In short, it forces a password to contain a number somewhere inside it. You could use a similar pattern to require two numbers or any other special character. Like the password example, this allows four to ten characters, but it allows special characters (asterisks, ampersands, and so on). A sequence of three, two, then four digits, with each group separated by a dash. A similar pattern could be used when requiring a phone number.

Given that most field types exist to interact with specific data types, one of the first things to consider is how to tell Django to handle that data type. This includes how to store it in the database, how to ensure validity of its value and how to represent that value in Python. These are some of the most fundamental aspects of field behavior, and properly altering them can open up a world of possibilities.

[a-zA-Z]\w*\d+\w*

\S{4,10}

\d{3}-\d{2}-\d{4}

* Many different regular expressions of varying complexity can validate e-mail addresses. See http://www. 4guysfromrolla.com/webtech/validateemail.shtml for a discussion of the subject and numerous examples.

get_internal_type(self)

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If the validation controls described so far are not flexible or powerful enough for you, and if you need more advanced or customized validation, then the CustomValidator control is what you need The CustomValidator allows you to execute your custom client-side and server-side validation routines You can associate these routines with the control so that validation is performed automatically If the validation fails, the PageIsValid property is set to false, as occurs with any other validation control The client-side and server-side validation routines for the CustomValidator are declared similarly They both take two parameters: a reference to the validator and a custom argument object This object provides a Value property that contains the current value of the associated input control (the value you have to validate) and an IsValid property through which you specify whether the input value is valid.

If you want to check that a number is a multiple of five, for example, you could use a client-side JavaScript validation routine like this: <script language="JavaScript"> function EmpIDClientValidate(ctl, args) { // the value is a multiple of 5 if the module by 5 is 0 argsIsValid=(argsValue%5 == 0); } </script> To associate this code with the control so that client-side validation is performed automatically, you simply need to set the ClientValidationFunction to the name of the function (in this case, EmpIDClientValidate) Next, when the page is posted back, ASP NET fires the CustomValidatorServerValidate event You handle this event to perform the same task using C# code And although the JavaScript logic is optional, you must make sure you include a server-side validation routine to ensure the validation is performed even if the client is using a down-level browser (or tampers with the web-page HTML).

Here s the C# server-side equivalent of the validation routine shown earlier: protected void EmpIDServerValidate(object sender, ServerValidateEventArgs args) { try { argsIsValid = (intParse(argsValue)%5 == 0); } catch { // An error is most likely caused by non-numeric data argsIsValid = false; } } Finally, here s an example CustomValidator tag that uses these routines: <asp:TextBox runat="server" ID="EmpID" /> <asp:CustomValidator runat="server" ControlToValidate="EmpID" ClientValidationFunction= EmpIDClientValidate ErrorMessage="ID must be a multiple of 5" Display="dynamic">* </asp:CustomValidator>.

This method returns a string, which helps determine how the database should store values for the field. The string itself isn t an actual database column type, but instead it s applied to

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