无论…还是…【wúlùn…háishi】

无论…还是… lists two or more options and says the result doesn't change across them. The main clause follows with 都 or 也 before the verb. 是 after 无论 is optional and common when the options are nouns.

都 in the main clause

The second clause needs 都 or 也. Without it the sentence is missing its other half.

• × 无论刮风还是下雨，他去跑步 → 无论刮风还是下雨，他都去跑步

还是, not 或者

The options after 无论 are an open choice, the same kind 还是 offers in a question, so 还是 joins them. 或者 belongs to statements where either option will do.

• × 无论你或者我，都不能去 → 无论你还是我，都不能去

Other ways to give the options

The options can also be a verb and its negative, or a question word with an adjective. Both still need 都.

无论…都 with a question word is the wider pattern and has its own point; this one is about listing the options with 还是.

无论 is neutral to formal. In conversation 不管 takes its place, with the same 还是 and 都.