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JavaScript RegExp exec() Method

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The exec() Method in JavaScript is used to test for the match in a string. If there is a match this method returns the first match else it returns NULL.

Syntax:

RegExpObject.exec(str)

Parameters:

  • str: It is the string to be searched. This is a required field. 

Return value:

  • This method returns an array that contains the matched text if the match is found, else it returns null.

Example 1: This example searches for the string “computer” in the original string. 

Javascript




function geek() {
    let str =
        "GeeksforGeeks is the " +
        "computer science portal for geeks.";
 
    let regex = new RegExp("computer",);
    // match "computer" in string.                      
    let rex = regex.exec(str);
    console.log(rex.length);
    console.log(rex)
}
geek()


Output

1
[
  'computer',
  index: 21,
  input: 'GeeksforGeeks is the computer science portal for geeks.',
  groups: undefined
]

Example 2: This example searches for the string “rep” in the original string.  

Javascript




function geek() {
    let str =
        "GeeksforGeeks is the" +
        " computer science " +
        "portal for geeks.";
    let regex = new RegExp("rep");
 
    // Match "rep" in string.
    let rex = regex.exec(str);
    console.log(rex);
}
geek()


Output

null

We have a complete list of Javascript Functions, to check those go through the Javascript Functions Complete Reference article.

Supported Browsers: The browsers supported by the JavaScript exec() Method are listed below: 

  • Google Chrome
  • Apple Safari
  • Mozilla Firefox
  • Opera
  • Internet Explorer

We have a complete list of Javascript RegExp expressions, to check those please go through this JavaScript RegExp Reference article.



Last Updated : 02 Jun, 2023
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