internal static Pattern getRegularExpressionPattern()
{
Pattern quote = IsChar('/');
Pattern escape = IsChar('\\').Seq(Patterns.HasAtLeast(1));
char[] not_allowed = new char[] { '/', '\n', '\r', '\\' };
Pattern content = Patterns.Or(escape, Patterns.NotAmong(not_allowed));
return(quote.Seq(content.Many()).Seq(quote));
}