Why is this regex allowing a caret?

Question

http://regexr.com/3ars8

^(?=.*[0-9])(?=.*[A-z])[0-9A-z-]{17}$

Should match \"17 alphanumeric chars, hyphens allowed too, must include at le

Answer 1

regex uses ASCII printable characters from the space to the tilde range.

Whenever we use [A-z] token it matches the following table highlighted characters. If we use [ -~] token it matches starting from SPACE to tilde.