Check if a string has a certain piece of text [duplicate]

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?

Here a benchmark for the most common ways to check if a string is in a string: jsben.ch/#/o6KmH — EscapeNetscape
– EscapeNetscape, Commented Oct 31, 2016 at 17:06

Eddie · Accepted Answer · 2018-11-01 14:36:42Z

488

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 1, 2018 at 14:36

answered Jul 8, 2011 at 19:53

Eddie

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7 Comments

mqchen Over a year ago

What if the string starts with "World"? The operator should probably be >= 0.

Eddie Over a year ago

If I understand correctly, and >=0 value is a match

Andrew Over a year ago

I like !== -1 better

Martin James Over a year ago

I like if (~test.indexOf('World')) better

Khom Nazid Over a year ago

When to use ES6?

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