asp.net phone validator.txt

pattern:
--------
\+?[0-9\-]+

examples:
---------
+972344333332
+9723-44333332
052-22233344
05233333333
1800-20-30-40

using:
------
<asp:TextBox ID="txtPhone" runat="server" MaxLength="30" CssClass="inputText" />
<asp:RequiredFieldValidator runat="server" ControlToValidate="txtPhone" Display="Dynamic" Text="Necessary" />
<asp:RegularExpressionValidator runat="server" ControlToValidate="txtPhone" Display="Dynamic" Text="Incorrect Phone" ValidationExpression="\+?[0-9\-]+" />