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Regular Expressions - also known as "Reg Ex" - are strings of text used to match patterns in other strings.
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In this chapter, you learn how to use the Validation Web controls to validate the information that a user enters into an HTML form.
You can use the Validation controls to perform very different types of form validation tasks.
The Validation controls automatically generate both client-side and server-side code.
If a browser is capable of supporting Java Script, client-side validation scripts are automatically sent to the browser.
The classic example is a search string that uses "wild cards" such as an "*" or "?
" (which are also used in "regular" regular expressions). NET has great support for Reg Ex but if you're looking for information about how to use it in VB 6, About Visual Basic has that too. To get the basic idea behind Reg Ex, open a "Search" in Windows Explorer to look for a file on your computer.
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You'll need to do this when creating a Cancel button.
See the last section of this chapter, "Disabling Validation," for sample code that demonstrates how to do this.
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.