Check IBAN format using RegularExpression in Code Behind

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My IBAN Format string is " DE55680501010022067234 " , First two characters represents the country code and followed by 20 numbers

My Code is:

C#

var varText = "DE55680501010022067234 ";
Regex reg = new Regex( @"/^DE\d{20}$/");

if (!reg.IsMatch(varText ))
{
   Response.Write("not valid");
}

How to check this in code behind without using Javascript function.

Posted 21-Jan-16 0:58am

vinu paul

Updated 21-Jan-16 1:09am

Tomas Takac

v4

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Tomas Takac 21-Jan-16 7:12am

If you have googled you might found this: Regex Class (System.Text.RegularExpressions)[^].

vinu paul 21-Jan-16 7:16am

Already googled,but can't get my appropriate regular expression

Tomas Takac 21-Jan-16 7:22am

I would remove the slashes at the beginning and at the end of the regex pattern, then it should be ok.

vinu paul 21-Jan-16 7:34am

After removing the slashes from the begining and at the end,got the solution.
Thank you :)

Tomas Takac 21-Jan-16 7:25am

Do you want the matching to succeed even if there are space before and after the IBAN and extract the IBAN itself?

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F-ES Sitecore · Accepted Answer · 2016-01-21T01:30:00

Two things, one is that you don't need the leading and trailing "/", that's when you're using js. Second if the only text you're testing contains the number you either need to trim it to remove the trailing space ("$" means "ends with" and your text ends with a space, not a number), or drop the "$", whichever you think gives the best solution.

C#

var varText = "DE55680501010022067234 ";
// dropping the $
Regex reg = new Regex(@"^DE\d{20}");

if (!reg.IsMatch(varText))
{
    Response.Write("not valid");
}

// using Trim
reg = new Regex(@"^DE\d{20}$");

if (!reg.IsMatch(varText.Trim()))
{
    Response.Write("not valid");
}