Blazor safely highlight text in a string

HighlightedText.cs

using AdminPwaEditor.Web.Client.Components.Base;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Rendering;

namespace AdminPwaEditor.Web.Client.Components.Controls;

public class HighlightedText : BaseComponent
{
    [Parameter, EditorRequired] public string Text { get; set; } = "";
    [Parameter] public string? Highlight { get; set; } = "";
    [Parameter] public string HighlightClass { get; set; } = "bg-primary-color-variant fw-semibold";

    protected override void BuildRenderTree(RenderTreeBuilder builder)
    {
        if (string.IsNullOrWhiteSpace(Highlight) || !Text.Contains(Highlight, StringComparison.OrdinalIgnoreCase))
        {
            builder.AddContent(0, Text);
            return;
        }

        var text = Text;
        builder.OpenElement(0, "p");
        for (var i = 1;;)
        {
            var index = text.IndexOf(Highlight, StringComparison.OrdinalIgnoreCase);
            if (index < 0)
            {
                builder.AddContent(i, text);
                break;
            }

            builder.AddContent(i++, text[..index]);
            builder.OpenElement(i++, "span");
            builder.AddAttribute(i++, "class", HighlightClass);
            builder.AddContent(i++, text.Substring(index, Highlight.Length));
            builder.CloseElement();
            text = text[(index + Highlight.Length)..];
        }

        builder.CloseElement();
    }
}