The concept of the regular expression character to solve the idea

The concept of regular expression characters
such as \w
Matches any character except A-Z, A-Z, 0-9, and underscore.
equivalent to [^a-za-z0-9_].
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What does any character here mean?
Is it the character above the keyboard? Or does it include characters that are similar to gibberish?

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Any character except A-Z, A-Z, 0-9, and underscore

Any character that can be entered
Note Character encoding
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Yes, you understand. In fact, you'll know by testing it yourself.

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