JavaScript | string.search()

The string.search() is an inbuilt function in JavaScript which is used to search for a match in between regular expressions and a given string object.

Syntax :

string.search(A)

Parameters: Here parameter “A” is a regular expression object.
Return Value: This function returns the index of the first match in between regular expression and the given string object and returns -1 if no match found.

JavaScript code to show the working of string.search()

Code #1:
Indexing starts from zero (0) and if at first attempt a alphabet is match, then it do not check further simply it return the index of that first matched alphabet.

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<script>
  
    // Taking input a string.
    var string = "GeeksforGeeks";
  
// Taking a regular expression.
var re1 = /G/;
var re2 = /e/;
var re3 = /s/;
  
// Printing the index of matching alphabets
document.write(string.search(re1) + "<br>");
document.write(string.search(re2) + "<br>");
document.write(string.search(re3));
  
< /script>

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Output:


0
1
4


Code #2:

Here in below code it can be seen that this function is only returning -1, because no matching found in between regular expression and input string.











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<script> 


  


    // Taking input a string. 


    var string = "GeeksforGeeks"; 


  


// Taking a regular expression. 


var re1 = /p/; 


var re2 = /1/; 


var re3 = / /; 


var re4 = /, /; 


  


// Printing the index of matching alphabets 


document.write(string.search(re1) + "<br>"); 


document.write(string.search(re2) + "<br>"); 


document.write(string.search(re3) + "<br>"); 


document.write(string.search(re4)); 


  


< /script> 



















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Output:


-1
-1
-1
-1



          
          
          
          

            

    

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