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e.g. only if you enter a product code that starts with the uppercase letter P and contains no more, or no fewer, than four numerals in a row. The RegularExpressionValidator control uses the regular expression P[0-9]{4}.

<asp:RegularExpressionValidator

   ControlToValidate="txtNumber"

   Text="Invalid Code!"

   ValidationExpression="P[0-9]{4}"

   Runat="Server" />

----------------------------------------------------------------

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e.g. you can use the following regular expression to check that an e-mail address starts with one or more nonwhitespace characters, followed by an @ sign, followed by one or more nonwhitespace characters, followed by a period, followed by one or more nonwhitespace characters.

<asp:RegularExpressionValidator

   ControlToValidate="txtEmail"

   Text="Invalid Code!"

   ValidationExpression="\S+@\S+\.\S+"

   Runat="Server" />

------------------------------------------------------------

e.g. If you want to exclude all e-mail addresses that do not end with a top-level omain name between two and three characters, such as .com, .net, and .ws, you would use this expression.

<asp:RegularExpressionValidator

   ControlToValidate="txtXiaoZ"

   Text="Invalid Code!"

   ValidationExpression="\S+@\S+\.\S{2,3}"

   Runat="Server" />

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e.g. This regular expression matches any expression that contains one or more word characters (a word character can be a letter, number, or the underscore character).

<asp:RegularExpressionValidator

   ControlToValidate="txtXiaoZ"

   Text="Invalid Code!"

   ValidationExpression="\w+"

   Runat="Server" />

-----------------------------------------------------------

e.g. This regular expression matches only expressions that are between 8 and 20 characters long.

<asp:RegularExpressionValidator

   ControlToValidate="txtXiaoZ"

   Text="Invalid Code!"

   ValidationExpression="\w{8,20}"

   Runat="Server" />

----------------------------------------------------------------

e.g. This regular expression requires you to enter at least one letter, followed by any number of word characters, followed by at least one number, followed by any number of word characters.

<asp:RegularExpressionValidator

   ControlToValidate="txtXiaoZ"

   Text="Invalid Code!"

   ValidationExpression="[a-zA-Z]+\w*\d+\w*"

   Runat="Server" />

----------------------------------------------------------------

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e.g.

(555) 555-5555

555.555.5555

555 555-555

<asp:RegularExpressionValidator

   ControlToValidate="txtPhone"

   Display="Dynamic"

   Text="Invalid Phone Number!"

   ValidationExpression="\(?\s*\d{3}\s*[\)\.\-]?\s*\d{3}\s*[\-\.]?\s*\d{4}"

   Runat="Server" />

--------------------------------------------------------------------

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e.g. This regular expression matches any string that begins with the characters http:// followed by one or more nonwhitespace characters, followed by a period, followed by one or more nonwhitespace characters.

<asp:RegularExpressionValidator

   ControlToValidate="txtHomepage"

   Display="Dynamic"

   Text="Invalid URL!"

   ValidationExpression="http://\S+\.\S+"

   Runat="Server" />

-------------------------------------------------------------------

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e.g. This expression matches any entry (including spaces) that contains between 0 and 10 characters.

<asp:RegularExpressionValidator

   ControlToValidate="txtLastname"

   Display="Dynamic"

   Text="Your last name can contain

         a maximum of 10 characters and no spaces!"

   ValidationExpression="\S{0,10}"

   Runat="Server" />

-------------------------------------------------------------------

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e.g. This expression matches strings that have no more or no fewer than five digits.

<asp:RegularExpressionValidator

   ControlToValidate="txtZipCode"

   Display="Dynamic"

   Text="Invalid ZIP Code!"

   ValidationExpression="\d{5}"

   Runat="Server" />