我必须在大字符串中搜索短语，长度可能为 500 或 600 或更长，现在我必须检查短语是否存在
phrase = "Lucky Draw"
big string1 = "I'm looking for Lucky Draw a way to loop through the sentences and check"
big string1 = "I'm looking for specialLucky Draw a way to loop through the sentences and check"
big string3 = "I'm looking for Lucky Draws a way to loop through the sentences and check"
bool success = Regex.Match(message, @"\bLucky Draw\b").Success;
我正在执行上述解决方法，但它不能满足所有情况。
当我有多个短语时我必须做什么，我想linq在这种情况下使用，例如：
bool success = Regex.Match(message, **arrayofstrings**).Success;