[Regular expression] Summary of regular rules

1. Commonly used regular rules

rule	meaning
\d	[0-9],number
\D	[^0-9], any character except numbers
\w	[0-9a-zA-Z_], numbers and letters underlined
\W	[^0-9a-zA-Z_], exclude any characters including numbers, letters and underscores
\s	[\t\v\n\r\f], whitespace symbols (including spaces, horizontal tabs, vertical tabs, line feeds, carriage returns, etc.)
\S	non-whitespace
i	case insensitive mode
g	Global match pattern
m	multi-line matching pattern
u	Wide character mode (multiple Chinese character matching)
s	Or omit line breaks (multiple lines are treated as a whole)
.	All characters except "\n" (newline character)
[\u4e00-\u9af5]	Match Chinese characters
^	start
$	Finish
\b	word boundaries
\B	non-word boundaries
wide character related
/\p{L}/gu	wide character punctuation
\p{N}/gu	wide character number
/\p{sc=Han}/to	Chinese character
Atomic group related
(?:\w)	Do not record groups
(?<dian>\.)	Atomic group alias
Use of $ symbol
$`(before matching content) $'(after matching content) $&(matching content)
affirmation
/Backing person (?=img)/, /Backing person (?!img)/	pre-assertion
(?<=I am the supporter), (?<! I am the supporter)	post-assertion
/(?<!.*good.*)人人/	global assertion
/\d+?/	Lazy matching (+ after?) is non-lazy by default

2. Commonly used regular methods

Symbols that need to be changed: period ,   parentheses (),  square brackets []     left and right slashes \/  vertical |

function	illustrate
string.matchAll(reg);	Return iterator
reg.lastIndex	Iteration properties of regular objects
reg.exec（string）	Regular object matching method
string.serch(reg);	Similar to indexof method
string.replace(reg， serch=> {…});
string.macth(reg);