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Sharepoint: Sharepoint custom list validation
$('input[title="MyColumnName"]').keyup(function () {
        this.value = this.value.replace(/[^a-zA-Z]/g, '');
    });

<%@ language="C#" %>
    <form id="form1" runat="server">
        <asp:TextBox ID="txtName" runat="server"/>
        <asp:Button ID="btnSubmit" runat="server" Text="Submit" />
        <asp:RegularExpressionValidator ID="regexpName" runat="server"
                                        ErrorMessage="This expression does not validate."
                                        ControlToValidate="txtName"
                                        ValidationExpression="^[a-zA-Z'.s]{1,40}$" />
    </form>