jQuery: Check if character is in string

Question

I want the simplest way to check if an underscore (_) is in a variable using jQuery and do something if is not..

if ( '_ is not in var') {
   // Do
}

Thanks!

Reigel Gallarde · Accepted Answer · 2010-06-29 09:51:27Z

62

var str = "i am a string with _";
if (str.indexOf('_') == -1) {
   // will not be triggered because str has _..
}

and as spender said below on comment, jQuery is not a requirement.. indexOf is a native javascript

edited Jun 29, 2010 at 9:51

answered Jun 29, 2010 at 9:43

Reigel Gallarde

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2 Comments

spender Over a year ago

It's probably important to highlight to OP that the solution does not require jQuery, as demonstrated.

Chris Over a year ago

Its worth noting that this isn't jQuery but basic javascript so could be used even without jQuery being loaded. The answer is correct of course, just a noteworthy addition given the question.

pbarney · Accepted Answer · 2020-08-27 22:05:46Z

14

There are several ways to do this.

indexOf() method:

if( str.indexOf('_') != -1 ){
   //do something
}
else{
   //do something 
}

Search() method:

 if( str.search("_")!=-1 ){
   //do something
 } 
 else {
  //Do something 
 }

:contains() selector:

 if( $("p:contains(_)") ).length{
   //Do something
 }
 else{
   //Do something
 }

using a regular expression:

 if( str.match(/_/g) ).length{
   //Do something
 }
 else{
   //Do something
 }

I think the first method is the simplest way.

edited Aug 27, 2020 at 22:05

pbarney

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answered Jan 22, 2016 at 9:46

Nishad Up

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