But in this we have to note one thing i.e. This pattern can be anything like regular expression or a string value itself.
Replace() function is used to replace the string as the name suggests it replaces whole or some string depending upon the input or pattern we pass. How Replace Function Works in JavaScript? Var str = document.getElementById("demo").innerHTML ĭocument.getElementById("demo").innerHTML = res This abc will be reaplce by balck from abc black. Prerss the bnutton to replace content "abc" with "black" in the content below To show basic usage of replace() function. It uses JavaScript Version i.e ECMAScript 1.
Both these parameters are required they are not optional. We can also say that this variable as a search value and a new value. So it will provide us the changed string with replaced content. Return value: This method will always return us the new string object without modifying the original string.In this only first occurrence will be replaced. substr (pattern): This would be the string that is going to be replaced by new content.regexp (pattern): This is used to replace, basically it matches the pattern with the string and replaced with a new substring.newSubStr (replacement): This is used to replace the content of the substring which is specified by the regular expression or string value itself.function (replacement): This is used to call a function that is responsible to create a new substring which in turn used to replace the content matched in the original string.Here we will discuss the below syntax in detail. Or var newString = str.replace(reg-expression|str, newSubstr|functionTocall) A parameter is a regular expression and another parameter which is B this will be a string that is responsible to replace the content from the given string.
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My recommendation is to use string.replaceAll() to replace strings.Start Your Free Software Development Course 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. 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. 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).