TypeScript string replace() method explanation with example:
replace method of string is used to replace a substring in a string. This is an inbuilt method and we can use it with a string in typescript.
In this post, I will show you how to use the replace() method with an example:
Syntax of replace():
replace is defined as below:
string.replace(subStr, newStr[, flags])
- subStr is the substring that needs to be replaced. Also, we can pass one regular expression as this parameter. It will replace all substrings that matches with the regular expression.
- newStr is the new string that we need to replace with the old string.
- flags is an optional parameter. This parameter is a string holding the combination of regular expression flags.
This method returns the newly created string.
Example of replace:
Let’s take a look at the below program:
let givenString = 'Hello World' let newStr = givenString.replace('World', 'Universe') console.log(newStr)
- givenString is the original string.
- Using replace, we replaced World with Universe.
- The result is stored in newStr.
It will print:
Note that it replaces the first occurrence of the word:
let givenString = 'Hello World World' let newStr = givenString.replace('World', 'Universe') console.log(newStr)
It will print:
Hello Universe World
Example of replace with regex:
We can also use regex with replace as like below:
let givenString = 'Hello World 123' let newStr = givenString.replace(/[0-9]/, '*') console.log(newStr)
It will replace 1 with *.
Hello World *23