JavaScript - String Search

JavaScript Search Methods

• String indexOf()
• String lastIndexOf()
• String search()
• String match()
• String matchAll()
• String includes()
• String startsWith()
• String endsWith()

 

indexOf()

let str = "Please locate where 'locate' occurs!";
str.indexOf("locate");

7

 

 

lastIndexOf()

let text = "Please locate where 'locate' occurs!";
text.lastIndexOf("locate");

21

 

 

indexOf(), lastIndexOf()텍스트가 없으면 -1을 반환합니다.

 

검색의 시작 위치로 두 번째 매개변수를 허용합니다.

let text = "Please locate where 'locate' occurs!";
text.indexOf("locate", 15);

 

 

 

match()

let text = "The rain in SPAIN stays mainly in the plain";
text.match("ain");

let text = "The rain in SPAIN stays mainly in the plain";
text.match(/ain/g);

3 ain,ain,ain

let text = "The rain in SPAIN stays mainly in the plain";
text.match(/ain/gi);

4 ain,AIN,ain,ain

 

 

 

matchAll()

const iterator = text.matchAll("Cats");

 

 

 

includes()

let text = "Hello world, welcome to the universe.";
text.includes("world");

true

let text = "Hello world, welcome to the universe.";
text.includes("world", 12);

false

 

 

 

 

startsWith()

let text = "Hello world, welcome to the universe.";
text.startsWith("Hello");

true

let text = "Hello world, welcome to the universe.";
text.startsWith("world", 5)

false

let text = "Hello world, welcome to the universe.";
text.startsWith("world", 6)

true

 

 

 

endsWith()

let text = "John Doe";
text.endsWith("Doe");

let text = "Hello world, welcome to the universe.";
text.endsWith("world", 11);

true