Purpose of [^\x20-\x7E] in regular expressions

Question

 [^\\x20-\\x7E]

I saw this pattern used for a regular expression in which the goal was to remove non-ascii characters from a string. What does it

Answer 1

It says something like: all characters that are not (^) in the range \x20-\x7E (hex 0x20 to 0x7E).

According to http://www.asciitable.com/, those are characters from space to ~.