CODEWITHSUNDEEP
jqueryvariables
jonagoldman
jonagoldman

Reputation: 8754

jQuery: Check if character is in string

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!

Upvotes: 26

Views: 100281

Answers (2)

Nishad Up
Nishad Up

Reputation: 3615

There are several ways to do this.

  1. indexOf() method:

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

  2. Search() method:

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

  3. :contains() selector:

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

  4. using a regular expression:

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

I think the first method is the simplest way.

Upvotes: 14

Reigel Gallarde
Reigel Gallarde

Reputation: 65284

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

Upvotes: 61

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