การค้นหาข้อความ js

รหัสตัวอย่าง

1
0

N

var str = "This is a test sentence";
var hasTest = str.includes("test");

if(hasTest == true){
	//do a thing 
}
1
0

N

var string = "Hello world!";
var n = string.search("w"); //now n equals 6
1
0

N

var str = "foobar"
var regex = /foo/g;
if (str.search(regex) !== -1) {
  alert("string conains foo!")
}

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