Nguyễn Khánk's Wiki

# Regular Expression

Tham khảo thêm (opens new window)

# Case: Bóc tách tên tác giả

var input = '/tac-gia/nguyen-khank.html';
var chunks = input.match(/(tac\-gia\/)([a-z\-]+)(\.html)/);
var authorSlug = chunks[2]; // nguyen-khank

# Case: Đổi size của href hình

"9abf121069d796db82c9dcf2e5be6aa5514821b9.jpg?image_crop_resized=100x60".replace(/image_crop_resized=(\d)*x(\d)*/, 'image_crop_resized=400x240');

# Case: Lấy giá trị trong ngoặc

/// get length of field type
const REGEX = /([a-z0-9]+\()(\d+)(\))/;
const r1 = "bigint2019(50)".match(REGEX); // r1[2] == 50
const r2 = "varchar(500)".match(/([a-z0-9]+\()(\d+)(\))/); // r2[2] == 500

# Case: Bóc tách lấy số

'1-20^32-34.21,12*15'.split(/[-^\,\.\*]/);  // ["1", "20", "32", "34", "21", "12", "15"]

# Bảng phong thần

# Modifiers

Modifier Description
g Perform a global match (find all matches rather than stopping after the first match)
i Perform case-insensitive matching
m Perform multiline matching

# Brackets

Brackets are used to find a range of characters:

Expression Description
[abc] Find any character between the brackets
[^abc] Find any character NOT between the brackets
[^0-9] Find any character NOT between the brackets (any non-digit)
(x|y) Find any of the alternatives specified

# Metacharacters

Metacharacter Description
. Find a single character, except newline or line terminator
\w Find a word character
\W Find a non-word character
\d Find a digit
\D Find a non-digit character
\s Find a whitespace character
\S Find a non-whitespace character
\b Find a match at the beginning/end of a word, beginning like this: \bHI, end like this: HI\b
\B Find a match, but not at the beginning/end of a word
\0 Find a NUL character
\n Find a new line character
\f Find a form feed character
\r Find a carriage return character
\t Find a tab character
\v Find a vertical tab character
\xxx Find the character specified by an octal number xxx
\xdd Find the character specified by a hexadecimal number dd
\udddd Find the Unicode character specified by a hexadecimal number dddd

# Quantifiers

Expression Description
n+ Matches any string that contains at least one n
n* Matches any string that contains zero or more occurrences of n
n? Matches any string that contains zero or one occurrences of n
n{X} Matches any string that contains a sequence of X n's
n{X,Y} Matches any string that contains a sequence of X to Y n's
n{X,} Matches any string that contains a sequence of at least X n's
n$ Matches any string with n at the end of it
^n Matches any string with n at the beginning of it
?=n Matches any string that is followed by a specific string n
?!n Matches any string that is not followed by a specific string n

# Tools & References

← Axios vs. Jquery Ajax →