Javascript replace
My recommendation is to use string.replaceAll() to replace strings. The method is a proposal at stage 4, and hopefully, it will land in a new JavaScript standard pretty soon. And dealing with a regular expression for a simple replacement of strings is overwhelming.įinally, the new string method string.replaceAll(search, replaceWith) replaces all string occurrences. Unfortunately, you cannot easily generate regular expressions from a string at runtime, because the special characters of regular expressions have to be escaped. Moreover, you'll read about the new proposal string.replaceAll() (at stage 4) that brings the replace all method to JavaScript strings.
JAVASCRIPT REPLACE HOW TO
This approach works, but it's hacky.Īnother approach is to use string.replace(/SEARCH/g, replaceWith) with a regular expression having the global flag enabled. In this post, you'll learn how to replace all string occurrences in JavaScript by splitting and joining a string, and string.replace() combined with a global regular expression. The primitive approach to replace all occurrences is to split the string into chunks by the search string, the join back the string placing the replace string between chunks: string.split(search).join(replaceWith).
JAVASCRIPT REPLACE CODE
String.replaceAll(search, replaceWith) is the best way to replace all string occurrences in a string let newStr str.replace (regexp, newSubstr) Code language: JavaScript (javascript) In this syntax, the replace () method find all matches in the str, replaces them by the newSubstr, and returns a new string ( newStr ). Example 2: Replace Character of a String Using RegEx // program to replace a character of a stringĬonst newText = string.'duck duck go'.replaceAll(' ', '-') replaces all occurrences of ' ' string with '-'. The array type in JavaScript provides us with splice () method that helps us in order to replace the items of an existing array by removing and inserting new elements at the required/desired index. You could also pass a regular expression (regex) inside the replace() method to replace the string. An item can be replaced in an array using two approaches: Method 1: Using splice () method.
So if there is a second match in the string, it won't be replaced.
When a string is passed in the replace() method, it replaces only the first instance of the string. In the above program, the replace() method is used to replace the specified string with another string. Output Mr Red has a blue house and a red car Example: Replace First Occurrence of a Character in a String // program to replace a character of a stringĬonst string = 'Mr Red has a red house and a red car' Ĭonst newText = string.replace('red', 'blue')