public static Builder IfMatchesExactly(this Builder builder, string filename) => builder.IfMatches(input => input == filename);
public static Builder IfFilenameEndsWith(this Builder builder, string filter) => builder.IfMatches(input => input.EndsWith(filter));
public static Builder IfMatches(this Builder builder, string pattern) => builder.IfMatches(Helpers.PatternToFunction(pattern));
public static Builder IfMatches(this Builder builder, Regex regex) => builder.IfMatches(regex.IsMatch);
public static Builder UseFallbackToFile(this Builder builder, String pattern, String fallbackFile) => builder .IfMatches(pattern) .Use((filename, provider) => provider.GetContent(filename)) .WithRouterPriority();
public static Builder UseStaticContent(this Builder builder, String pattern, String content) => builder .IfMatches(pattern) .Use(content) .WithPreProcessPriority();