Definition and Usage The replace() method is used to replace some characters with some other characters in a string. This method supports ...
Definition and Usage
The replace() method is used to replace some characters with some other characters in a string.This method supports regular expressions. You can learn about the RegExp object in our JavaScript tutorial.
Syntax
| stringObject.replace(findstring,newstring) |
| Parameter | Description |
|---|---|
| findstring | Required. Specifies a string value to find. To perform a global search add a 'g' flag to this parameter and to perform a case-insensitive search add an 'i' flag |
| newstring | Required. Specifies the string to replace the found value from findstring |
Tips and Notes
Note: The replace() method is case sensitive.Example 1 - Standard Replace
In the following example we will replace the word Microsoft with 1000sourcecodes:| <script type="text/javascript"> var str="Visit Microsoft!"; document.write(str.replace(/Microsoft/, "1000sourcecodes")); </script> |
The output of the code above will be:
| Visit 1000sourcecodes! |
Note: In the following example the word Microsoft will not be replaced (because the replace() method is case sensitive):
| <script type="text/javascript"> var str="Visit Microsoft!"; document.write (str.replace(/microsoft/,"1000sourcecodes")); </script> |
The output of the code above will be:
| Visit Microsoft! |
Example 2 - Case-insensitive Search
In the following example we will perform a case-insensitive search, and the word Microsoft will be replaced:| <<script type="text/javascript"> var str="Visit Microsoft!"; document.write (str.replace(/microsoft/i, "1000sourcecodes")); </script> |
The output of the code above will be:
| Visit 1000sourcecodes! |
Example 3 - Global Search
In the following example we will perform a global match, and the word Microsoft will be replaced each time it is found:| <script type="text/javascript"> var str="Welcome to Microsoft! "; str=str + "We are proud to announce that Microsoft has "; str=str + "one of the largest Web Developers sites in the world."; document.write(str.replace (/Microsoft/g, "1000sourcecodes")); </script> |
The output of the code above will be:
| Welcome to 1000sourcecodes! We are proud to announce that 1000sourcecodes has one of the largest Web Developers sites in the world. |
Example 4 - Global and Case-insensitive Search
In the following example we will perform a global and case-insensitive match, and the word Microsoft will be replaced each time it is found, independent of upper and lower case characters:| <script type="text/javascript"> var str="Welcome to Microsoft! "; str=str + "We are proud to announce that Microsoft has "; str=str + "one of the largest Web Developers sites in the world."; document.write(str.replace (/microsoft/gi, "1000sourcecodes")); </script> |
The output of the code above will be:
| Welcome to 1000sourcecodes! We are proud to announce that 1000sourcecodes has one of the largest Web Developers sites in the world. |
