"Contains" in JS

@daveyerwinMay 22.2016 — #http://www.w3schools.com/jsref/jsref_indexOf.asp

@lafmafinauthorMay 22.2016 — #http://www.w3schools.com/jsref/jsref_indexOf.asp[/QUOTE]

Thank you, what are the numbers? I need something like:

var x = Earth is a planet

if (x contains planet)

{

react();

}

@daveyerwinMay 22.2016 — #var str = 'Earth is a planet';

alert(str.indexOf('planet'))//alerts 11

@rootMay 22.2016 — #and you can use a regular expression

<i>
 </i>s = "man";
 console.log( "--------------------------------------------" );
 console.log( s + " with no express conditions or rules");
 str1 = "The old man is fishing all day";
 str2 = "The old woman is gutting fish all day";
 var reg = /man/;
 s1 = "&gt; "+ s +" is "+ (reg.test(str1)?"":"not ") +"in "+str1;
 s2 = "&gt; "+ s +" is "+ (reg.test(str2)?"":"not ") +"in "+str2;
 console.log(s1);
 console.log(s2);
 console.log( "--------------------------------------------" );
 console.log( s + " with word boundaries");
 var reg = /bmanb/;
 s1 = "&gt; "+ s +" is "+ (reg.test(str1)?"":"not ") +"in "+str1;
 s2 = "&gt; "+ s +" is "+ (reg.test(str2)?"":"not ") +"in "+str2;
 console.log(s1);
 console.log(s2);
 console.log( "--------------------------------------------" );
 s = "Man";
 console.log( s + " as case insensitive without word boundaries");
 var reg = /Man/i; // case insensitive
 s1 = "&gt; "+ s +" is "+ (reg.test(str1)?"":"not ") +"in "+str1;
 s2 = "&gt; "+ s +" is "+ (reg.test(str2)?"":"not ") +"in "+str2;
 console.log(s1);
 console.log(s2);
 console.log( "--------------------------------------------" );
 console.log( s + " as case insensitive with word boundaries");
 var reg = /bManb/i; // case insensitive with word boundaries
 s1 = "&gt; "+ s +" is "+ (reg.test(str1)?"":"not ") +"in "+str1;
 s2 = "&gt; "+ s +" is "+ (reg.test(str2)?"":"not ") +"in "+str2;
 console.log(s1);
 console.log(s2);
 console.log( "--------------------------------------------" );

outputs the following

--------------------------------------------
 man with no express conditions or rules
 <i>&gt; </i>man is in The old man is fishing all day
 <i>&gt; </i>man is in The old woman is gutting fish all day
 -------------------------------------------
 man with word boundaries
 <i>&gt; </i>man is in The old man is fishing all day
 <i>&gt; </i>man is not in The old woman is gutting fish all day
 --------------------------------------------
 Man as case insensitive without word boundaries
 <i>&gt; </i>Man is in The old man is fishing all day
 <i>&gt; </i>Man is in The old woman is gutting fish all day
 --------------------------------------------
 Man as case insensitive with word boundaries
 <i>&gt; </i>Man is in The old man is fishing all day
 <i>&gt; </i>Man is not in The old woman is gutting fish all day
 --------------------------------------------

F12 opens the console.log where the output goes to...

Regular Expressions are allot more powerful but can cause headaches.

@Ay__351_eMay 27.2016 — #

 <br/>
 &lt;!DOCTYPE html&gt;
 &lt;html&gt;
 &lt;head&gt;
 &lt;meta charset="utf-8"&gt;
 &lt;/head&gt;
 &lt;body&gt;
 
 &lt;script&gt;
 String.prototype.contains = function(kelime){
 for(var i = 0; i &lt; this.length; i++){
 // alert(this.slice(i,kelime.length + i ) );
 if(this.slice(i,kelime.length + i ) == kelime ){
 return true;
 }
 }
 return false;
 }
 
 
 var x = "Earth is a planet";
 if (x.contains("planet") )
 {
 alert("Aranan kelime cümlenin içinde var. ");
 //react();
 }
 
 &lt;/script&gt;
 
 &lt;/body&gt;
 &lt;/html&gt;

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"Contains" in JS

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