What is a valid URL query string?

Question

What characters are allowed in an URL query string?

Do query strings have to follow a particular format?

Answer 1

This link has the answer and formatted values you all need.

https://perishablepress.com/url-character-codes/

For your convenience, this is the list:

<     %3C
>     %3E
#     %23
%     %25
{     %7B
}     %7D
|     %7C
\     %5C
^     %5E
~     %7E
[     %5B
]     %5D
`     %60
;     %3B
/     %2F
?     %3F
:     %3A
@     %40
=     %3D
&     %26
$     %24
+     %2B
"     %22
space     %20