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How to use the replace() method with regular expression In Javascript

Using indexOf() and slice() methods

  • First, declare a string variable str with the value “GeeksforGEEKS”.
  • Now, declare a substring variable with the value “GEEKS” to search for and replace.
  • Use the replace method with a regular expression to globally replace all instances of the substring with the replacement value “geeks”.
  • It logs the result which will be “Geeks For geeks “.

Example: The below code will explain the use of replace() method with regular expression.

Javascript




let str = "GeeksforGEEKS";
let substring = "GEEKS";
let replacement = "Geeks";
console.log("Before replacement: ", str)
let finalResult =
    str.replace(new RegExp(substring, "g"),
        replacement);
 
console.log("After Replacement: ", finalResult);
 






                        









													
													
												

												
												

													
													
Output


Before replacement:  GeeksforGEEKS
After Replacement:  w3wiki




													
													
												

												
											

											
											

												
Replace all Occurrences of a Substring in a String  in JavaScript

												
												

													
													
In Javascript, a string is a sequence of characters represented with quotation marks. We are given a string and we need to replace all occurrences of a substring from the given string.

													
													
												

												
												

													
													


Table of Content


    

  • Using replace() method with regular expression
    • 

  • Using indexOf() and slice() methods
    • 

  • Using replaceAll() method
    • 




													
													
												

												
											

										


										
										

											
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														Using the replace() method with regular expression

													

														First, declare a string variable str with the value “GeeksforGEEKS”.
Now, declare a substring variable with the value “GEEKS” to search for and replace.
Use the replace method with a regular expression to globally replace all instances of the substring with the replacement value “geeks”.
It logs the result which will be “Geeks For geeks “....
													

												
											

											
											

												
													

														Using indexOf() and slice() methods

													

														...
													

												
											

											
											

												
													

														Using replaceAll() method

													

														The indexOf() method finds the index of the first occurrence of the substring.
If the index is greater than or equal to 0 (found a match), it slices the string before and after the match and inserts the replacement.
It recursively calls itself to keep replacing all other matches.
It returns the final string after replacing all matches....
													

												
											

											
										


									

									

										
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												Using indexOf() and slice() methods