Javascript find and replace text in html
To replace text in a JavaScript string the replace() function is used. The replace() function takes two arguments, the substring to be replaced and the new string that will take its place. Regex(p) can also be used to replace text in a string. ,Whatever the reason, knowing how to replace text in a JavaScript string can be useful.,In this guide, we’re going to break down the JavaScript string replace() function and explore how it can be used to amend the text.,In this tutorial, we broke down how to use the JavaScript replace() function. We also discussed how regex could be used to perform more advanced replace functions on a string.
var name = "Pieter"; console.log(name.replace("Pi", "P"));Answer by Royal O’Connor
Using a function to return the replacement text:,Note: If you are replacing a value (and not a regular expression), only the first instance of the value will be replaced. To replace all occurrences of a specified value, use the global (g) modifier (see «More Examples» below).,replace() does not change the original string.,Perform a global replacement:
Definition and Usage
The replace() method searches a string for a specified value, or a regular expression, and returns a new string where the specified values are replaced.
Answer by Malaya Hudson
1 Author wanted to «sniff out a specific text character across a document» not just in a string – Max Malyk Sep 5 ’13 at 19:07 ,This replaces all instances of replacetext with actualtext,I’m wondering if there is a lightweight way I could use JavaScript or jQuery to sniff out a specific text character across a document; say € and find all instances of this character. And then! Write an ability to replace all instances of this with say a $.,It seems to do good job of only replacing text and not messing with other elements
How about this, replacing @ with $ :
Answer by Stephanie Ponce
How to parse float with two decimal places in JavaScript ?,Writing code in comment? Please use ide.geeksforgeeks.org, generate link and share the link here.,Example 1: The replace() function will be used to replace the string ‘Hello’ with ‘Hi’,Example 2: Use the replace() function to replace all occurrences of the string ‘Hello’ with ‘Hi’
string.replace(valueToBeReplaced, newValue)Answer by Remington Sierra
var myStr = 'this,is,a,test'; var newStr = myStr.replace(/,/g, '-'); console.log( newStr ); // "this-is-a-test"Answer by Ryder Cole
Example: javascript replace text within dom
document.body.innerHTML = document.body.innerHTML.replace('hello', 'hi');Answer by Joey McCarthy
replacement – This parameter will be directly passed to the String.replace function, so you can either have a string replacement (using $1, $2, $3 etc. for backreferences) or a function.,As I said, a string can be passed as the second parameter and you can use ‘$1, $2 etc.’ for backreferences:,One notable limitation is that the function cannot search for text nested between seperate nodes, for example, searching for “pineapple” in the following HTML would not work:, Thanks for reading! Please share your thoughts with me on Twitter. Have a great day!
function findAndReplace(searchText, replacement, searchNode) < if (!searchText || typeof replacement === 'undefined') < // Throw error here if you want. return; >var regex = typeof searchText === 'string' ? new RegExp(searchText, 'g') : searchText, childNodes = (searchNode || document.body).childNodes, cnLength = childNodes.length, excludes = 'html,head,style,title,link,meta,script,object,iframe'; while (cnLength--) < var currentNode = childNodes[cnLength]; if (currentNode.nodeType === 1 && (excludes + ',').indexOf(currentNode.nodeName.toLowerCase() + ',') === -1) < arguments.callee(searchText, replacement, currentNode); >if (currentNode.nodeType !== 3 || !regex.test(currentNode.data) ) < continue; >var parent = currentNode.parentNode, frag = (function() < var html = currentNode.data.replace(regex, replacement), wrap = document.createElement('div'), frag = document.createDocumentFragment(); wrap.innerHTML = html; while (wrap.firstChild) < frag.appendChild(wrap.firstChild); >return frag; >)(); parent.insertBefore(frag, currentNode); parent.removeChild(currentNode); > >Answer by Stefan Larsen
Find and replace text in DOM. No library or framework is required to use this function, it’s entirely stand-alone., dom, javascript, replace, text ,Find and replace text in DOM, JavaScript
function findAndReplace(searchText, replacement, searchNode) < if (!searchText || typeof replacement === 'undefined') < // Throw error here if you want. return; >var regex = typeof searchText === 'string' ? new RegExp(searchText, 'g') : searchText, childNodes = (searchNode || document.body).childNodes, cnLength = childNodes.length, excludes = 'html,head,style,title,link,meta,script,object,iframe'; while (cnLength--) < var currentNode = childNodes[cnLength]; if (currentNode.nodeType === 1 && (excludes + ',').indexOf(currentNode.nodeName.toLowerCase() + ',') === -1) < arguments.callee(searchText, replacement, currentNode); >if (currentNode.nodeType !== 3 || !regex.test(currentNode.data)) < continue; >var parent = currentNode.parentNode, frag = (function() < var html = currentNode.data.replace(regex, replacement), wrap = document.createElement('div'), frag = document.createDocumentFragment(); wrap.innerHTML = html; while (wrap.firstChild) < frag.appendChild(wrap.firstChild); >return frag; >)(); parent.insertBefore(frag, currentNode); parent.removeChild(currentNode); > >Answer by Coraline Guerrero
You can use the JavaScript replace() method in combination with the regular expression to find and replace all occurrences of a word or substring inside any string.,However, if the string comes from unknown/untrusted sources like user inputs, you must escape it before passing it to the regular expression. The following example will show you the better way to find and replace a string with another string in JavaScript.,How to replace character inside a string in JavaScript,How to check whether a string contains a substring in JavaScript
3 Ways To Replace All String Occurrences in JavaScript
In this post, you’ll learn how to replace all string occurrences in JavaScript by splitting and joining a string, string.replace() combined with a global regular expression, and string.replaceAll() .
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Table of Contents
1. Splitting and joining an array
If you google how to «replace all string occurrences in JavaScript», the first approach you are likely to find is to use an intermediate array.
For example, let’s replace all spaces ‘ ‘ with hyphens ‘-‘ in ‘duck duck go’ string:
‘duck duck go’.split(‘ ‘) splits the string into pieces: [‘duck’, ‘duck’, ‘go’] .
Then the pieces [‘duck’, ‘duck’, ‘go’].join(‘-‘) are joined by inserting ‘-‘ in between them, which results in the string ‘duck-duck-go’ .
Here’s a generalized helper function that uses splitting and joining approach:
This approach requires transforming the string into an array, and then back into a string. Let’s continue looking for better alternatives.
2. replace() with a global regular expression
The string method string.replace(regExpSearch, replaceWith) searches and replaces the occurrences of the regular expression regExpSearch with replaceWith string.
To make the method replace() replace all occurrences of the pattern — you have to enable the global flag on the regular expression:
- Append g to the end of regular expression literal: /search/g
- Or when using a regular expression constructor, add ‘g’ to the second argument: new RegExp(‘search’, ‘g’)
Let’s replace all occurrences of ‘ ‘ with ‘-‘ :
The regular expression literal /\s/g (note the g global flag) matches the space ‘ ‘ .
‘duck duck go’.replace(/\s/g, ‘-‘) replaces all matches of /\s/g with ‘-‘ , which results in ‘duck-duck-go’ .
You can easily make case insensitive replaces by adding i flag to the regular expression:
The regular expression /duck/gi performs a global case-insensitive search (note i and g flags). /duck/gi matches ‘DUCK’ , as well as ‘Duck’ .
Invoking ‘DUCK Duck go’.replace(/duck/gi, ‘goose’) replaces all matches of /duck/gi substrings with ‘goose’ .
2.1 Regular expression from a string
When the regular expression is created from a string, you have to escape the characters — [ ] / < >( ) * + ? . \ ^ $ | because they have special meaning within the regular expression.
Because of that, the special characters are a problem when you’d like to make replace all operation. Here’s an example:
The above snippet tries to transform the search string ‘+’ into a regular expression. But ‘+’ is an invalid regular expression, thus SyntaxError: Invalid regular expression: /+/ is thrown.
Escaping the character ‘\\+’ solves the problem. Try the fixed demo.
If the first argument search of string.replace(search, replaceWith) is a string, then the method replaces only the first occurrence of search :
‘duck duck go’.replace(‘ ‘, ‘-‘) replaces only the first appearance of a space.
Finally, the method string.replaceAll(search, replaceWith) replaces all appearances of search string with replaceWith .
Let’s replace all occurrences of ‘ ‘ with ‘-‘ :
‘duck duck go’.replaceAll(‘ ‘, ‘-‘) replaces all occurrences of ‘ ‘ string with ‘-‘ .
string.replaceAll(search, replaceWith) is the best way to replace all string occurrences in a string
Note that browser support for this method is currently limited, and you might require a polyfill.
3.1 The difference between replaceAll() and replace()
The string methods replaceAll(search, replaceWith) and replace(search, replaceWith) work the same way, except 2 things:
- If search argument is a string, replaceAll() replaces all occurrences of search with replaceWith , while replace() replaces only the first occurence
- If search argument is a non-global regular expression, then replaceAll() throws a TypeError exception.
The first approach to replacing all occurrences is to split the string into chunks by the search string and then join back the string, placing the replace string between the chunks: string.split(search).join(replaceWith) . This approach works, but it’s hacky.
Another approach is to use string.replace(/SEARCH/g, replaceWith) with a regular expression having the global flag enabled.
Unfortunately, you cannot easily generate regular expressions from a string at runtime, because the special characters of regular expressions have to be escaped.
Finally, the string method string.replaceAll(search, replaceWith) replaces all string occurrences.
I recommend using string.replaceAll() to replace strings.
What other ways to replace all string occurrences do you know? Please share in a comment below!
JavaScript replace HTML tags | Replace RegEx example
Frist get tags you want to replace then replace old HTML with new HTML. You have to use innerHTML, replace method, and regex (regular expression) to replacing HTML tags using JavaScript.
JavaScript replace HTML tags example code
Let’s see example code with 2 scenarios first if only want signal tag and second is if want all tags.
Replace single Tag
For a single-element tag change, you have to create a new element and move the contents into it. Example:
Hello World How are you? This tag nog change
Replace all tag
It’s easy to change all tags, for example changing the span tag with div tag.
Hello World How are you? This tag nog change
Do comment if you have any doubts and suggestions on this topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version