Check if a string has a certain piece of text

Question

Possible Duplicates:
Check if text is in a string
JavaScript: string contains

I'm trying to check if a string I import into my application has a certain piece of text. I know how to do this with jQuery, but how do I do it with straight up JavaScript?

duplicate of http://stackoverflow.com/questions/1789945/how-can-i-check-if-one-string-contains-another-substring — Soman Dubey, Mar 08 '16 at 12:39
Here a benchmark for the most common ways to check if a string is in a string: http://jsben.ch/#/o6KmH — EscapeNetscape, Oct 31 '16 at 17:06

Eddie · Accepted Answer · 2018-11-01T14:36:42.210

432

Here you go: ES5

var test = 'Hello World';
if( test.indexOf('World') >= 0){
  // Found world
}

With ES6 best way would be to use includes function to test if the string contains the looking work.

const test = 'Hello World';
if (test.includes('World')) { 
  // Found world
}

edited Nov 01 '18 at 14:36

answered Jul 08 '11 at 19:53

Eddie

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31

What if the string starts with "World"? The operator should probably be `>= 0`. – mqchen Jul 08 '11 at 19:55
If I understand correctly, and >=0 value is a match – Eddie Jul 08 '11 at 19:56
5

I like !== -1 better – Andrew Jul 24 '17 at 18:45
4

I like `if (~test.indexOf('World'))` better – Martin James Jul 12 '18 at 19:38
1

When to use ES6? – Khom Nazid Jul 31 '19 at 05:32
@KhomNazid https://caniuse.com/#feat=es6 – Daan Mar 09 '20 at 13:11
test.includes('World') works best for me. – Eric Carr Mar 04 '21 at 16:09

Check if a string has a certain piece of text

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