How to compose a regular expression, only English letters, numbers and spaces, no symbols?

Question

PHP

The site, after a request to it, gives out nonsense in a strange encoding, which one it was not found. Help compose a regular expression for the parse. Without Russian letters and symbols.

Answer 1

[a-zA-Z0-9\s]+

Answer 2

/[^\W]|\S([A-Za-z0-9]{1,40})/ did like this, finds only the first word, I think it will do