Skip to main content

Regular expression for alphanumeric with space in asp.net c#

How to validate that string contains only alphanumeric value with some spacial character and with whitespace and how to validate that user can only input alphanumeric with given special character or space in a textbox (like name fields or remarks fields).

In remarks fields we don't want that user can enter anything, user can only able to enter alphanumeric with white space and some spacial character like -,. etc if you allow.

Some of regular expression given below for validating alphanumeric value only, alphanumeric with whitspace only and alphanumeric with whitespace and some special characters.

Alphanumeric regex : ^[a-zA-Z0-9]+$
Alphanumeric with whitspace : ^[a-zA-Z0-9 ]+$
Alphanumeric with given special character : ^[a-zA-Z0-9 ,.'@]+$     (Add spacial character  as you need inside square bracket)

Following code demonstrating the various ways of implementation.

Validate that string contains only alphanumeric value as well as space character through regular expression
public bool IsAlphaNumeric(string inputString)
{
    Regex r = new Regex("^[a-zA-Z0-9]+$");
    if (r.IsMatch(inputString))
        return true;
    else
        return false;
}


Verifying that textbox text contains only alphanumeric value as well as space character through Regular Expression Validator in asp.net (validation controls).

<asp:TextBox ID="txtName" runat="server" ></asp:TextBox>

<asp:RegularExpressionValidator ID="REValphaOnly" runat="server" ErrorMessage="Please enter only alphanumeric." ControlToValidate="txtName" ValidationExpression="^[a-zA-Z0-9]+$"></asp:RegularExpressionValidator>


Place regular expression as you need in ValidationExpression fields.

Popular posts from this blog

Uploading large file in chunks in Asp.net Mvc c# from Javascript ajax

Often we have a requirement to upload files in Asp.net, Mvc c# application but when it comes to uploading larger file, we always think how to do it as uploading large file in one go have many challenges like UI responsiveness, If network fluctuate for a moment in between then uploading task get breaks and user have to upload it again etc.

What is NameSpace in .Net

This a basic question which allways asked in the interview that what is the namespace ,do you know about namespace,can you tell me some words about namespace.

How to handle click event of linkbutton inside gridview

Recently I have posted how to sort only current page of gridview, Scrollble gridview with fixed header through javascript, File upload control inside gridview during postback and now i am going to explain how to handle click event of linkbutton or any button type control inside gridview.

We can handle click event of any button type control inside gridview by two way first is through event bubbling and second one is directly (in this type of event handling we need to access current girdviewrow container)

Scrollable Gridview with fixed headers in asp.net

horizontal and vertical scrollable Gridview with static header row.fixed header in gridview in asp.net.static header in gridview through java script.I was looking for a solution for this for a long time and found most of the answers are not working or not suitable for my situation i also find most of the java script code for that they worked but only with the vertical scroll not with the horizontal scroll and also combination of header and rows doesn't match.

how $document.ready() is different from window.onload()

we often use window.onload() in javascript and $document.ready() in jquery and assume that both are same just jquery library wrap up javascript window.onload() and introduce $document.ready() but no there is much difference between them below is the explanation -