JQuery string contains check

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?

a **benchmark** of different solutions can be found here: http://jsben.ch/#/RVYk7 — EscapeNetscape, Nov 11 '16 at 10:24
@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. — Fr0zenFyr, Feb 21 '19 at 12:27

score 290 · Accepted Answer · edited Aug 17 '17 at 10:19

290

You can use javascript's indexOf function.

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

edited Aug 17 '17 at 10:19

Jonathan

answered Sep 16 '10 at 15:11

gen_Eric

4

this would works only when substring has exact match, will not work around "DEfG" as f is small case. – Red Swan Jul 23 '12 at 11:31
10

@RedSwan: you could convert the string to uppercase or lowercase and then do the comparison, problem solved. – diggersworld Nov 08 '14 at 09:40
1

[`indexOf()` is not supported in IE < 9](http://stackoverflow.com/q/8848097/339874) – mulllhausen Oct 11 '16 at 07:19
2

@mulllhausen: It's 2016, this answer is 6 years old, and most sites have stopped supporting IE < 9. – gen_Eric Oct 11 '16 at 13:18
1

@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. – mulllhausen Oct 12 '16 at 02:58
1

For clarity, you should use === instead of == – A Friend Sep 19 '18 at 01:23
@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. – gen_Eric Aug 05 '21 at 19:35
@RedSwan or you could also use `indexOf("DEfG", StringComparison.OrdinalIgnoreCase);` – Miro Feb 28 '22 at 14:12

score 17 · Answer 2 · answered Feb 28 '14 at 02:29

17

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

sttr1.search(str2);

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

answered Feb 28 '14 at 02:29

Khaihkd

1

It would be nice to note that [Array.prototype.search](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/search) implicitly converts the string to a regular expression which may not give the desired result. – Uyghur Lives Matter Mar 13 '15 at 17:55
1

Last row should be: str1.search(str2); not sttr1, IMHO – Isma Jan 21 '20 at 10:16

score 10 · Answer 3 · edited Jul 02 '14 at 03:46

10

Please try:

str1.contains(str2)

edited Jul 02 '14 at 03:46

nstCactus

answered Jul 02 '14 at 02:35

scott

2

CurrentPage.contains is not a function – mzonerz Jul 19 '16 at 10:44
4

It's because .contains() is a jQuery method. – Zahid Saeed Sep 01 '16 at 07:59
I get `contains is not a function` – Anupam Feb 18 '23 at 17:48
That's how it's done $(":contains('Hello')") – SneepS NinjA Feb 28 '23 at 13:03

score 9 · Answer 4 · answered Feb 14 '17 at 23:03

9

I use,

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

answered Feb 14 '17 at 23:03

eaglei22

score 5 · Answer 5 · answered Jul 19 '16 at 10:55

5

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

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

            alert("found");
        }

answered Jul 19 '16 at 10:55

mzonerz

5 Answers5