regular expression in asp.net

@"^[ 0-9+-\)\(]*$".  

This is a r开发者_如何转开发egular expression on a textbox which i'm using to allow digits,space,+,=,()round brackets. but i'm not getting the desired result.

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Your expression contains +- but your description says you want +=. It cant be that simple?

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The usual way is to have code like the following in your aspx or ascx file:

<asp:TextBox ID="MyTextbox" runat="server"/>
<asp:RegularExpressionValidator ID="MyTextboxValidator" runat="server" 
    ControlToValidate="MyTextbox"
    ValidationExpression="[ 0-9+\-\)\(]*]" ErrorMessage="Use digits and some others" />

When the user leaves the textbox and/or submits the form, the validator fires and blocks submission on error (displaying the message).

You could change the validation expression server-side:

MyTextboxValidator.ValidationExpression = "[ 0-9+\-\)\(]*]";

Notes:

• you don't need the ^ and $ to anchor this expression in this validator
• you need to escape the "-" else it will mean a range from "+" to ")"