如何讓小數點前後只有一個數字的texbox？

Question

<asp:RegularExpressionValidator 
    ID="RegularExpressionValidator1" 
    CssClass="error" 
    SetFocusOnError="true" 
    runat="server" 
    ErrorMessage="Error.." 
    Display="Dynamic" 
    ControlToValidate="txttextbox"  
    ValidationExpression="^[0-9]+\.[0-9]{1}$" 
    ValidationGroup="insert"> 

Answer 1

試試這個

<asp:RegularExpressionValidator 
    ID="RegularExpressionValidator1" 
    CssClass="error" 
    SetFocusOnError="true" 
    runat="server" 
    ErrorMessage="Error.." 
    Display="Dynamic" 
    ControlToValidate="txttextbox" 
    ValidationExpression="^\d{1}(\.\d{0,1})?$"  
    ValidationGroup="insert"> 

Regex Demo