How to Remove Style Attribute From HTML String Using Regex

If you want to remove inline css, there is no need to bother Regex, just use jQuery[^] and call .removeAttr() method[^] on the html element.
For example:

<p style="background-color: red">This is another paragraph.</p>

this will remove the style

$("p").removeAttr("style");

+++++[Round 2]+++++
To do it on code behind
aspx:

<asp:Label ID="Label1" runat="server" Text="Label" style="background-color: red"></asp:Label>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />

aspx.cs:

protected void Button1_Click(object sender, EventArgs e)
{
    Label1.Style.Clear();
}