I don’t think anyone but you ever said he was irrelevant, or bragged about not knowing who he was. You’re extracting a ton of meaning to a short comment which I just don’t think is actually there

https://socialblade.com/youtube/handle/asmontv says there’s over thousand youtube channels with more subscribers than him. He might well be large & influential in his niche, but it’s unlikely that people outaide his niche will know who he is. Do you think you’ve heard of 1,000 biggest youtubers whose channels aren’t about things you’re interested in?

Pewdiepie, by comparison, is the 12th most subscribed channel on youtube. I think you’re underestimating how much more famous that makes him with the general public.

#\s+ is:

• #: a literal #

• \s: any whitespace character (space, tab etc)

• +: the previous thing (here the whitespace), one or more times

In words: “a hash followed by at least one whitespace character”

#[^\s]. is:

• #: a literal #

• [^\s] : a negated character class. This matches anything other than the set of characters after the ^. \s has the same meaning as before, any whitespace character

• . : matches any single character

In words: “a hash followed by any character other than a whitespace character, then any character”.

https://regex101.com/ is really good for explaining regex