JQuery string contains check [duplicate]

Question

I need to check whether a string contains another string or not?

var str1 = "ABCDEFGHIJKLMNOP";
var str2 = "DEFG";

Which function do I use to find out if str1 contains str2?

Talus

a benchmark of different solutions can be found here: jsben.ch/#/RVYk7 – Shanley

@EscapeNetscape: Nice to see a benchmark link. If I change the observation string to a very long UTF-8 multibyte text, the results change drastically? Also, the results changed with change in position of substring in the observation string. BTW, which one were you suggesting. – Devondevona

Answer 1

You can use javascript's indexOf function.

var str1 = "ABCDEFGHIJKLMNOP";
var str2 = "DEFG";
if(str1.indexOf(str2) != -1){
    console.log(str2 + " found");
}

Eavesdrop

this would works only when substring has exact match, will not work around "DEfG" as f is small case. – Panthea

@RedSwan: you could convert the string to uppercase or lowercase and then do the comparison, problem solved. – Talus

indexOf() is not supported in IE < 9 – Fellner

@mulllhausen: It's 2016, this answer is 6 years old, and most sites have stopped supporting IE < 9. – Eavesdrop

@RocketHazmat: fair enough. I just commented because it wasn't mentioned in any of the answers on this page and people may be interested to know. – Fellner

For clarity, you should use === instead of == – Metallography

@DeepSojitra jQuery is not a language. It's a JavaScript library. The jQuery library does not contain this function, it's part of the JavaScript language. Also this question is 11 years old and this answer was accepted. – Eavesdrop

@RedSwan or you could also use indexOf("DEfG", StringComparison.OrdinalIgnoreCase); – Depose

Answer 2

var str1 = "ABCDEFGHIJKLMNOP";
var str2 = "DEFG";

sttr1.search(str2);

it will return the position of the match, or -1 if it isn't found.

Sorrento

It would be nice to note that Array.prototype.search implicitly converts the string to a regular expression which may not give the desired result. – Foley

Last row should be: str1.search(str2); not sttr1, IMHO – Brother

Answer 3

Please try:

str1.contains(str2)

Incense

CurrentPage.contains is not a function – Hluchy

It's because .contains() is a jQuery method. – Glaydsglaze

I get contains is not a function – Amylose

That's how it's done $(":contains('Hello')") – Dilemma

Answer 4

I use,

var text = "some/String"; text.includes("/") <-- returns bool; true if "/" exists in string, false otherwise.

Batruk

Answer 5

If you are worrying about Case sensitive change the case and compare the string.

 if (stringvalue.toLocaleLowerCase().indexOf("mytexttocompare")!=-1)
        {

            alert("found");
        }

Hluchy