How to check if one string contains in another string in js or jquery

Question

How to check if one string contains in another string in js or jquery For example : String str1 = asbf_000.String str2 = asbf; Then str1.contains(str2) should return true.I tried using includes() in JS but did not work

Answer 1

"contains" is not a function is javascript, but "includes" is. You can use it like

let str1 = "asbf_000";
let str2 = "asbf";
const isSubstring = str1.includes(str2);
console.log(isSubstring); // this will log true in the console

You can check a working demo here on jsfiddle

Answer 2

You can check it using indexOf() function by checking str1.indexOf(str2)

var str1 = 'asbf_000'
var str2 = 'asbf';
console.log(checkExistOrnot(str1,str2))

function checkExistOrnot(str1,str2)
{
 if (str1.indexOf(str2) >= 0)
  return true
 else
   return false
}

Answer 3

The simplest way to check substring is by using method "indexOf".

<script>
    function subString(str1,str2){
       return str1.indexOf(str2)
    }
    var result = subString("asbf_000","asbf");
</script>

if result is greater then -1 then substring exist else not

Answer 4

let a = 'Hello world';
let b = 'ld';

let position = a.indexOf(b);

this will give you the position of first occurrence of string b in string a and if it is not present in string a, it would give you -1

Answer 5

You can use String#indexOf().

Based on the docs, .indexOf() for Strings accepts a search value parameter. If the search value is found, it returns a non-negative value. If it does not find your search value, it returns -1.

let word = 'Hello world!';
let query = 'world';
let anotherQuery = 'value';

word.indexOf(query); // returns 6 - which is a non-negative value
word.indexOf(anotherQuery); // returns -1

Which you can use it this way.

let isExist = word.indexOf(query) !== -1;

Or you can write a function for it

function find(haystack, needle) {
  let isFound = haystack.indexOf(needle);

  return isFound !== -1;
}

let isExist = find(word, query);