C＃正则表达式匹配文本字符串

Question

I am trying to use a regex to find text inside a string. For example, have this string:

one,two,three,four

If I want to see if it has one OR two, I can use "one|two". How do I create a regex for determining whether the string has one AND two?

Answer 1

^(?=.*\bone\b)(?=.*\btwo\b)

=如果字符串中同时存在“一个”和“两个”，则两个匹配的前瞻性断言。