How to validate a string with a Regular Expression?

[Friso Wiskerke]

Hi All,

I'm trying to find a way to validate a string variable in the code behind
with a regular expression. I know there are validator controls but these all
work with the ControlToValidate property and I don't have a control, just a
string variable.

Can anyone help me out?

TIA,
Friso Wiskerke

 

[Cor Ligthert]

Friso,

The validators as you describe it are in my opinion not code behind.

Can you tell something more what you want to achieve, because when you use
code behind you have to send information to that. And for that you use one
or the other control.

To say it in other words, somewhere should the information be typed in.

Cor

 

[Friso Wiskerke]

Cor,

The data that I'm trying to validate resides in a database. I writing code
that's validating the current data in the database, that's done by looping
through a datatable (or datareader) and check each row field by field.

When using a ValidatorControl you have to assign a control to it. Only
controls of type: TextBox, ListBox, DropDownList, RadioButtonList,
HtmlInputText, HtmlInputFile, HtmlSelect and HtmlTextArea can be assigned,
so I can't assign a DataColumn object or a string variable to it.

That's why I'm looking for a way to achieve some other kind regular
expression validation way in code-behind .

Cheers,
Friso

 

[Cor Ligthert]

Friso,

I think that via this newsgroup it is to difficult to help you.

However on this pages is in my opinion bassicly your problem described.
Therefore look to this and maybe you can than ask question refering too
these pages.

http://samples.gotdotnet.com/quickstart/aspplus/

I hope this helps something

Cor

 

[Friso Wiskerke]

Finally found it searching through the namespaces !!

There's a function: System.Text.RegularExpressions.Regex.IsMatch() which
takes 2 parameters: "input" and "pattern". The first is the string to
validate, the seccond is the regular expression that the string is validated
against. The result is a boolean, True if it's a match.

Thanx,
Friso

 

[Herfried K. Wagner [MVP]]

I'm trying to find a way to validate a string variable in the code behind
with a regular expression. I know there are validator controls but these
all
work with the ControlToValidate property and I don't have a control, just
a
string variable.

Take a look at 'System.Text.RegularExpression.Regex' and its 'IsMatch'
method. If you want to get all matches, use 'Matches'.

 

[Cor Ligthert]

Friso,

I was thinking that you did not know how to get that string from the
clientside to the code behind.

Here a website for regulair expressions

http://www.regexlib.com/Default.aspx

Maybe that helps you making it.

Cor