public Impl(string pattern)
{
this.Pattern = pattern;
Regex = new(() =>
{
string regexPattern = "";
foreach (string part in SRegex.Split(pattern.Trim(), "(\\*+|[\\?\\|])"))
{
if (part.Length == 0)
{
continue;
}
regexPattern += part[0] switch
{
'*' => ".*",
'?' => "\\w+",
'|' => "\\b",
_ => SRegex.Escape(part),
};
}
return(new SRegex($"^{regexPattern}$"));
});
}
/// <summary>
/// Remove all query parameters matching a particular parameter name from a URI.
/// </summary>
/// <remarks>
/// <para>This method handles percent-encoded octets as UTF-8 encoded characters in both the
/// <paramref name="parameter"/> argument and the query string.</para>
/// </remarks>
/// <param name="uri">The URI.</param>
/// <param name="parameter">The name of the parameter to remove.</param>
/// <returns>A <see cref="Uri"/> representing the input <paramref name="uri"/> with all query parameters with a name matching <paramref name="parameter"/> removed from the query string.</returns>
/// <exception cref="ArgumentNullException">
/// <para>If <paramref name="uri"/> is <see langword="null"/>.</para>
/// <para>-or-</para>
/// <para>If <paramref name="parameter"/> is <see langword="null"/>.</para>
/// </exception>
/// <exception cref="ArgumentException">If <paramref name="parameter"/> is empty.</exception>
public static Uri RemoveQueryParameter(Uri uri, string parameter)
{
if (uri == null)
{
throw new ArgumentNullException("uri");
}
if (parameter == null)
{
throw new ArgumentNullException("parameter");
}
if (string.IsNullOrEmpty(parameter))
{
throw new ArgumentException("parameter cannot be empty");
}
string query = uri.Query;
if (string.IsNullOrEmpty(query))
{
return(uri);
}
StringBuilder expressionBuilder = new StringBuilder();
byte[] encodedParameter = Encoding.UTF8.GetBytes(UriDecode(parameter));
expressionBuilder.Append("[?&]");
foreach (byte b in encodedParameter)
{
string escapedUpper = b.ToString("X2");
expressionBuilder.Append("(?:");
if (b == '&' || b == '?' || b == '=')
{
// these character can only appear percent-encoded in a parameter name
expressionBuilder.Append('%');
}
else
{
expressionBuilder.Append(Regex.Escape(((char)b).ToString()));
expressionBuilder.Append("|%");
}
foreach (var escaped in escapedUpper)
{
if (escaped != char.ToLowerInvariant(escaped))
{
expressionBuilder.Append('[').Append(escaped).Append(char.ToLowerInvariant(escaped)).Append(']');
}
else
{
expressionBuilder.Append(escaped);
}
}
expressionBuilder.Append(")");
}
expressionBuilder.Append("=[^?&]*");
Regex expression = new Regex(expressionBuilder.ToString());
UriBuilder uriBuilder = new UriBuilder(uri);
string modifiedQuery = expression.Replace(uriBuilder.Query, string.Empty);
// setting the UriBuilder.Query property adds a leading `?` even if one is already present in `modifiedQuery`
if (!string.IsNullOrEmpty(modifiedQuery))
{
modifiedQuery = modifiedQuery.Substring(1);
}
uriBuilder.Query = modifiedQuery;
return(uriBuilder.Uri);
}
