Some examples of metacharacters and special symbols in JS regular

1. metacharacters in regular Expressions:

The code is as follows
([{\^ $ |)? * +. Example 1: Alert (/\?/.test ("?")); Example 2: Alert (/\\?/.test ("?"));

Double escape, avoid translation by translation n mode?

2. Special characters

1. Use ASCII to represent a character

Specifies a two-bit hexadecimal code preceded by x, such as: X62 is a B-B character with an ASCII code of 98, equal to 16 62

Example 1:

The code is as follows
var scolor= "Blue"; var reb=/\x62/; Alert (Reb.test (Scolor));

1428 in to B

Example 2:

The code is as follows
var scolor= "Blue"; var reb=/\142/; Alert (Reb.test (Scolor));

2.Unicode with u plus four hexadecimal notation B is 0062

Example 3:

The code is as follows
var scolor= "Blue"; var reb=/\u0062/; Aert (Reb.test (Scolor));

3. Other special characters

R

special character
	description
T	tab
n	return
page feed
a	alert character
e	escape character
">" "> CX	corresponding control characters for x
b	fallback character
v	vertical tab
	null character