// :
// "" :
// ([a-z])\d
"a123, b, c".match(/[a-z](?=\d)/g);
// ["a"]
//
"".match( /(?!)[\u4e00-\u9fa5]/g );
//["", "", "", ""]
//
// 1: (?!)
// 2: (?!)[\u4e00-\u9fa5] ""
Thank you for the old driver"s guide and thanks for your help! 3Q
-
[\ u4e00 -\ u9fa5] represents unicode coding specification Chinese character collection
(?! pattern) represents a positive negative pre-check
(?! (you) means that the content you match does not include the word "you"
(?! You) [\ u4e00 -\ u9fa5] means to match all non-"you" characters
= above is the previous answer, but I feel that there are some knowledge blind spots, so it is necessary to study deeply, so I have the following answer =
[\ u4e00 -\ u9fa5] represents unicode coding specification Chinese character collection
the origin of this collection, extract the key words of the reference document:
in 1984, the text coding Committee (ISO/TC 97/SC2) of ISO decided to formulate a set of coding specifications (ISO 10646), which is to deal with the world's words uniformly in the way of exchanging text sets. And set up a working group (ISO/TC 97/SC 2 / WG 2)
in May 1993, formally formulated the original unified ideographic characters of China, Japan and South Korea, located in the area of U+4E00-U+9FFF, with a total of 20902 characters
[\ u4E00 -\ u9FFF]representing the unified ideographic characters of China, Japan and South Korea
, and the specific location of the real 20902 Chinese characters is
0x4E000x9FA5
:
"Windows(?!95|98|NT|2000)""Windows3.1""Windows""Windows2000""Windows"
WindowsWindows
"(?!windows)PC" "macPC""PC""WindowsPC""PC"
:
"(?!windows)PC" "macPC""PC""WindowsPC""PC"
(?!pattern):
(lookahead)(lookbehind) :
(?!pattern)
pattern
" regex represents regular expression" regexregularre" re(?!g)" reg
(?!pattern)
()
''.match( /(?!\s)/g ) g(s)
''1011111111
'' '[1][2][3][4][5][6][7][8][9][10][11]' 11
(?!)
"", ""8
''.match( /(?!)[\u4e00-\u9fa5]/g )
''.match( /(?!)/g )
2356789118
''.match( /(?!)[\u4e00-\u9fa5]/g )
(?!)
[\u4e00-\u9fa5]
(?!)[\u4e00-\u9fa5] (?!)8
'[1][2][3][4][5][6][7][8][9][10][11]'235678911825689
this is the answer.
the coding segment of Chinese characters in UTF-8 starts from 0x4e00 and ends with 9fa5
? Represents a character, ! You means not you this character
?! You means any character that cannot be you
() is used for grouping. After matching, you can refer to the matching character
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