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Editorial Team
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Asked: 2026-06-02T05:16:36+00:00

In My Project, I want to add CssClass to All asp:Buttons which don’t have

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In My Project, I want to add CssClass to All asp:Buttons which don’t have the CssClass attribute.How can I use regular expressions to search and replace All?

search and replace this

<asp:Button ID="buttonSearch" runat="server" Text="Search" OnClick="buttonSearch_Click" />

into the following

<asp:Button ID="buttonSearch" runat="server" Text="Search" OnClick="buttonSearch_Click"  CssClass="button-default" />
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1 Answer

  1. Editorial Team

    You can’t do it with “regular” VS find/replace regexes because they don’t support lookaround assertions.

    You can do it using a special plugin, though. It’s called Regular Expressions Margin and supports .NET style regexes:

    Screenshot

    Search for

    <asp:Button\b(?![^<>]*\bCssClass)([^<>]*)/>

    and replace all with

    <asp:Button\1 CssClass="button-default" />
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