ASP.NET Tutorial/Validation/Regular Expression
Содержание
- 1 Commonly Used Regular Expressions
- 2 Metacharacters for Matching Single Characters
- 3 Metacharacters for Matching Types of Characters
- 4 Quantifiers
- 5 quantifiers used to create patterns that match a variable number of characters at a certain position in the string
- 6 Regular Expression based validation (C#)
- 7 RegularExpressionValidator compares value against a regular expression
- 8 The predefined character classes
- 9 Use asp:RegularExpressionValidator to check the email address
- 10 Use asp:RegularExpressionValidator to check the zip code
- 11 Use Regular expression to validate a Phone number
Commonly Used Regular Expressions
<source lang="csharp">
Content Regular Expression E-mail address[*] \S+@\S+\.\S+ Password \w+ Specific-length password \w{4,10} Advanced password [a�CzA�CZ]\w{3,9} Another advanced password [a�CzA�CZ]\w*\d+\w* Limited-length field \S{4,10} Social Security number \d{3}-\d{2}-\d{4}</source>
Metacharacters for Matching Single Characters
<source lang="csharp">
Character Escapes Description Ordinary characters Characters other than .$^{[(|)*+?\ match themselves. \b Matches a backspace. \t Matches a tab. \r Matches a carriage return. \v Matches a vertical tab. \f Matches a form feed. \n Matches a newline. \ If followed by a special character (one of .$^{[(|)*+?\),
this character escape matches that character literal.
For example, \+ matches the + character.</source>
Metacharacters for Matching Types of Characters
<source lang="csharp">
Character Class Description . Matches any character except \n. [aeiou] Matches any single character specified in the set. [^aeiou] Matches any character not specified in the set. [3-7a-dA-D] Matches any character specified in the specified ranges (in the example the ranges are 3�C7, a�Cd, A�CD). \w Matches any word character; that is, any alphanumeric character or the underscore (_). \W Matches any nonword character. \s Matches any whitespace character (space, tab, form-feed, newline, carriage return, or vertical feed). \S Matches any nonwhitespace character. \d Matches any decimal character. \D Matches any nondecimal character.</source>
Quantifiers
<source lang="csharp">
Quantifier Description
- Zero or more matches
+ One or more matches ? Zero or one matches {N} N matches {N,} N or more matches {N,M} Between N and M matches</source>
quantifiers used to create patterns that match a variable number of characters at a certain position in the string
<source lang="csharp">
?: Zero or one times
- Zero or more times
+: One or more times {n}: Exactly n times {n,}: At least n times {n,m}: At least n times but no more than m times</source>
Regular Expression based validation (C#)
<source lang="csharp">
File: Default.aspx <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="RegularExpressionTest" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">
<title>Regular Expression Test</title>
</head> <body>
<form id="form1" runat="server">
<asp:textbox id="txtExpression"
runat="server"
Width="192px"></asp:textbox>
<asp:button id="cmdSetExpression"
runat="server"
Width="138px"
Text="Set This Expression"
CausesValidation="False"
OnClick="cmdSetExpression_Click">
</asp:button>
<asp:label id="lblExpression"
runat="server"
Height="21px"
Width="512px" >Current Expression: (none)</asp:label>
<asp:label id="Label1"
runat="server" >New Expression:</asp:label>
<asp:validationsummary id="ValidationSummary1" runat="server" ></asp:validationsummary>
<asp:regularexpressionvalidator id="TestValidator"
runat="server"
EnableClientScript="False"
ErrorMessage="Failed Validation"
ControlToValidate="txtValidate"></asp:regularexpressionvalidator>
<asp:textbox id="txtValidate" runat="server" Width="192px"></asp:textbox>
<asp:button id="cmdValidate" runat="server" Width="139px" Text="Validate"></asp:button>
<asp:label id="Label2" runat="server" Height="16px" Width="184px" >Test Current Expression:</asp:label>
</form>
</body> </html>
File: Default.aspx.cs using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; public partial class RegularExpressionTest : System.Web.UI.Page {
protected void cmdSetExpression_Click(object sender, EventArgs e)
{
TestValidator.ValidationExpression = txtExpression.Text;
lblExpression.Text = "Current Expression: ";
lblExpression.Text += txtExpression.Text;
}
}</source>
RegularExpressionValidator compares value against a regular expression
<source lang="csharp">
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">
<title>Show RegularExpressionValidator</title>
</head> <body>
<form id="form1" runat="server">
<asp:Label
id="lblEmail"
Text="Email Address:"
AssociatedControlID="txtEmail"
Runat="server" />
<asp:TextBox
id="txtEmail"
Runat="server" />
<asp:RegularExpressionValidator
id="regEmail"
ControlToValidate="txtEmail"
Text="(Invalid email)"
ValidationExpression="\w+([-+."]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"
Runat="server" />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</form>
</body> </html></source>
The predefined character classes
<source lang="csharp">
. : Any character \d: Any digit \D: Any non-digit \s: Any white-space character (such as spaces, tabs, newlines, returns, and backspaces) \S: Any character other than a white space character \w: Any word character \W: Any character other than a word character</source>
Use asp:RegularExpressionValidator to check the email address
<source lang="csharp">
<html><body>
<form runat="server">
<asp:Label id="lblMessage" runat="server" />
<asp:Panel id="Panel1" runat="server">
| Email (.ru"s only): |
<asp:TextBox id="tbEmail"
runat="server" />
|
<asp:Button id="Submit" runat="server"
text="Add" />
|
|
</asp:Panel> </form>
</body></html></source>
Use asp:RegularExpressionValidator to check the zip code
<source lang="csharp">
<html><body>
<form runat="server">
<asp:Label id="lblMessage" runat="server" />
<asp:Panel id="Panel1" runat="server">
| City, State, ZIP (5-digit): |
<asp:TextBox id="tbCity"
runat="server" />,
<asp:TextBox id="tbState" runat="server"
size=2 />
<asp:TextBox id="tbZIP" runat="server"
size=5 />
|
<asp:Button id="Submit" runat="server"
text="Add" />
|
|
</asp:Panel> </form>
</body></html></source>
Use Regular expression to validate a Phone number
<source lang="csharp">
<html><body>
<form runat="server">
<asp:Label id="lblMessage" runat="server" />
<asp:Panel id="Panel1" runat="server">
| Phone (xxx-xxxx): |
<asp:TextBox id="tbPhone" runat="server"
size=11 />
|
<asp:Button id="Submit" runat="server"
text="Add" />
|
|
</asp:Panel> </form>
</body></html></source>
