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New Message on BDOTNET
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From: MSFT_Saurabh
Message 9 in Discussion
Hi !
Elan,
Here is the sample code to use Regular
Expressions:
Using the
RegExp Object :
Function RegExpTest(patrn, strng)
Dim
regEx, Match, Matches ' Create variable.
Set regEx =
New RegExp ' Create a regular
expression.
regEx.Pattern = patrn ' Set
pattern.
regEx.IgnoreCase = True ' Set case
insensitivity.
regEx.Global = True ' Set global
applicability.
Set Matches = regEx.Execute(strng) '
Execute search.
For Each Match in Matches ' Iterate
Matches collection.
RetStr = RetStr &
"Match found at position "
RetStr = RetStr
& Match.FirstIndex & ". Match Value is
'"
RetStr = RetStr & Match.Value &
"'." & vbCRLF
Next
RegExpTest =
RetStr
End Function
MsgBox(RegExpTest("is.", "IS1 is2 IS3 is4"))
Hand-on Lab Using Regular
Expressions to Match a Pattern :
Open Visual Studio .NET.
Create a new Visual C# Console Application.
Specify the using keyword on the
Text.RegularExpressions namespace so that you will not be
required to qualify declarations in those namespaces later in your code. The
using statement must be used prior to any other declarations:
using System.Text.RegularExpressions;
Define a new regular expression that will use a
pattern match to validate an e-mail address. The following regular expression
is structured to accomplish three things:
Capture the substring before the @ symbol and
put that into the "user" group.
Capture the substring after the @ symbol and put
that into the "host" group.
Make sure that the first half of the string does
not have an @ symbol. Regex emailregex = new Regex("(?<user>[EMAIL
PROTECTED])@(?<host>.+)");
Define a new string containing a valid e-mail
address. This provides a default value if the method's command-line argument
is empty: String s = "[EMAIL PROTECTED]";
Check to see if there are any command-line
parameters; if there are, retrieve the first parameter and assign it to the
variable "s". if ( args.Length > 0 ) {
s = args[0];
}
Use the Match method to pass in
the e-mail address variable and return a new Match object.
The Match object will return regardless of whether any
matches were found in the source string. Match m = emailregex.Match(s);
By examining the Success
property, we can decide whether to continue processing the
Match object or to print an error message. If successful,
display the "user" and "host" named groups within the Groups
collection of the Match object. if ( m.Success ) {
Console.WriteLine("User: " + m.Groups["user"].Value);
Console.WriteLine("Host: " + m.Groups["host"].Value);
} else {
Console.WriteLine(s + " is not a valid email address");
}
Console.WriteLine();
To keep the console window open after running the
application, add the following lines of code: System.Console.WriteLine("Press Enter
to Continue...");
System.Console.ReadLine();
Build your project.
After this
hands-on, I am sure that you will anxious to know more on Regular Expression. So
for that you can go through some of the below given site
:
Introduction
to Regular Expressions:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/script56/html/reconIntroductionToRegularExpressions.asp
Regular Expression Language Elements:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/cpconregularexpressionslanguageelements.asp
Site devoted
to Regular Expressions :
http://www.regular-expressions.info/dotnet.html
Hope this
helps you out. In case not, you can always revert back on the
same.
take
care...<o:p> </o:p>
Regards,
Saurabh Verma
Machrotech (India)
Pvt. Ltd.
Microsoft
India Community Star
MCT.NET, MCSD.NET (EA), MCAD.NET, MCDBA<o:p></o:p>
<o:p> </o:p>
-----Original Message-----
From: Elankathir
[mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 10, 2004
6:11 PM
To: BDOTNET
Subject: Re: Regular Expression in
ASP.net
New Message on BDOTNET
Regular
Expression in ASP.net
Reply
Reply to Sender Recommend
Message 5 in
Discussion
From: Elankathir
hi Pramis !
How to form the
Regular Expression, i have no idea about that, Please give me some
guide line about that.
Thanks and Regards,
Elankathir.
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