Method EscapeCssSelector

dotnet/src/webdriver/By.cs:390–401

Escapes invalid characters in a CSS selector. The selector to escape. The selector with invalid characters escaped.

(string selector)

    /// <param name="selector">The selector to escape.</param>
    /// <returns>The selector with invalid characters escaped.</returns>
    internal static string EscapeCssSelector(string selector)
    {
        string escaped = InvalidCharsRegex.Replace(selector, @"\$1");
        if (selector.Length > 0 && char.IsDigit(selector[0]))
        {
            int digitCode = 30 + int.Parse(selector.Substring(0, 1), CultureInfo.InvariantCulture);

            escaped = $"\\{digitCode.ToString(CultureInfo.InvariantCulture)} {selector.Substring(1)}";
        }

        return escaped;
    }

    private static readonly Regex InvalidCharsRegex = new Regex(@"([ '""\\#.:;,!?+<>=~*^$|%&@`{}\-/\[\]\(\)])", RegexOptions.Compiled);
}