Reserved and unsafe characters in URLs

Use the Us-ascii character set to display characters when writing URLs.

http://www.google.com

If you need to use a character in a URL that does not belong to this character set, you will encode the character with a special symbol.

For example: the most commonly used spaces are indicated by%20, e.g. http://www.google.com/new%20123.html

In addition to those characters that cannot be displayed, you need to encode those reserved (reserved) characters and unsafe (unsafe) characters in the URL.

The so-called reserved characters are those characters that have a particular meaning in the URL. Unsafe characters are characters that have no special meaning in the URL, but may have special meaning in the context in which the URL is located. For example, double quotation marks ("")

Partial reserved characters and unsafe characters and their URL encoding
Character	Describe	Usage	Coding
;	Semicolon	Keep	%3b
/	Slash	Keep	%2f
?	Question mark	Keep	%3f
:	Colon	Keep	%3a
@	"At" Symbol	Keep	%4o
=	Equals	Keep	%3d
&	"and" symbols	Keep	%26
<	Less than sign	Not safe	%3c
>	Greater than sign	Not safe	%3e
"	Double quotes	Not safe	%22
#	Well number	Not safe	%23
%	Percent Sign	Not safe	%25
{	Left Curly Brace	Not safe	%7b
}	Closing curly Braces	Not safe	%7d
|	Vertical	Not safe	%7c
\	Reverse Slash	Not safe	%5c
^	Add font	Not safe	%5e
~	Wave	Not safe	%7e
[	Left Middle Bracket	Not safe	%5b
]	Right Middle Bracket	Not safe	%5d
`	Inverted single quotation marks	Not safe	%60
	Space	Not safe	%20

MyStr = Mystr.replace ("'", "%2b")//single quotation mark

MyStr = Mystr.replace ("+", "%2b")
MyStr = Mystr.replace ("*", "%2a")
MyStr = Mystr.replace ("!", "%21")

MyStr = Mystr.replace ("$", "%24")

Here is the code reference given on the W3Schools website

The default Character-set in HTML5 is UTF-8.

From From

Character	Windows-1252	UTF-8
Space	%20	%20
!	%21	%21
"	%22	%22
#	%23	%23
$	%24	%24
%	%25	%25
&	%26	%26
'	%27	%27
(	%28	%28
)	%29	%29
*	%2a	%2a
+	%2b	%2b
,	%2c	%2c
-	%2d	%2d
.	%2e	%2e
/	%2f	%2f
0	%30	%30
1	%31	%31
2	%32	%32
3	%33	%33
4	%34	%34
5	%35	%35
6	%36	%36
7	%37	%37
8	%38	%38
9	%39	%39
:	%3a	%3a
;	%3b	%3b
<	%3c	%3c
=	%3d	%3d
>	%3e	%3e
?	%3f	%3f
@	%40	%40
A	%41	%41
B	%42	%42
C	%43	%43
D	%44	%44
E	%45	%45
F	%46	%46
G	%47	%47
H	%48	%48
I	%49	%49
J	%4a	%4a
K	%4b	%4b
L	%4c	%4c
M	%4d	%4d
N	%4e	%4e
O	%4f	%4f
P	%50	%50
Q	%51	%51
R	%52	%52
S	%53	%53
T	%54	%54
U	%55	%55
V	%56	%56
W	%57	%57
X	%58	%58
Y	%59	%59
Z	%5a	%5a
[	%5b	%5b
\	%5c	%5c
]	%5d	%5d
^	%5e	%5e
_	%5f	%5f
`	%60	%60
A	%61	%61
B	%62	%62
C	%63	%63
d	%64	%64