Replace String Characters in JavaScript

Detailed explanation of JavaScript string replacement methods and FAQ

This article will explore two methods of replacing string characters in JavaScript: internal JavaScript code and internal HTML for web pages.

Replace strings inside JavaScript code

The most direct way is to use the replace() method:

str = str.replace("find","replace");

This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g:

str = str.replace(/find/g, "replace");

Replace strings inside web HTML

Use jQuery:

$("#text").val( $("#text").val().replace('.', ':') );

This code takes the value of the text box, replaces the . with :, and then updates the value of the text box.

Use JavaScript:

var elmOperator = document.getElementById(elm.id.replace('Include', 'Operator'));

This code replaces the string from the element ID.

Other alternative methods

.replaceWith( newContent ) Method

Use jQuery:

$('.third').replaceWith($('.first'));

This method replaces the element selected by the .first selector with the element selected by the .third selector.

Use JavaScript:

var str = "Visit BLOGOOLA!"; document.write(str.replace("BLOGOOLA", "JQUERY4U"));

This method replaces strings directly in JavaScript code.

Replace the value of the form selection

//For the input element $('input:text.items').val(function(index, value) { return value ' ' this.className; });

This code adds its class name after the value of each matching input box.

Replace foreign characters in HTML

var temp = new String('This fori<gn chars="" st="" test="">ring... So????'); document.write(temp '<br>'); temp = temp.replace(/[^a-zA-Z 0-9] /g,''); document.write(temp '<br>');</gn>

This code uses regular expressions to remove non-alphanumeric characters in strings.

Reference: https://www.php.cn/link/7a4d21f40402d068ec5369232b395901

JavaScript String Replacement Frequently Asked Questions

How to replace all occurrences of strings in JavaScript?

replace() method only replaces the first match by default. All matches can be replaced by regular expressions and global flag g.

Can we use the replace() method to change characters at a specific index?

replace() method cannot directly replace characters at a specific index. You need to convert the string into a character array, modify the array elements, and then convert the array back to a string.

How to use the replace() method with function?

The second parameter of the

replace() method can be a function. The function is called after a match, and its return value is used as a replacement string.

How to use the replace() method to delete characters in a string?

Replace the characters to be deleted with an empty string.

How to replace multiple different strings at once?

Chain call the replace() method.

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