JavaScript Replace () method

Article transferred from http://www.w3school.com.cn/jsref/jsref_replace.asp

character	Replace text
$, $ 、...、	The text that matches the 1th to 99th sub-expression in RegExp.
$&	A substring that matches the regexp.
$`	The text that is located to the left of the matching substring.
$	The text on the right side of the matching substring.
$$	Direct volume symbol.

Example 1

In this example, we will replace "Microsoft" in the string with "W3school":

<script type= "Text/javascript" >var str= "Visit microsoft!" document.write ( str.replace(/Microsoft/, "W3School") ) </script>

Output:

Visit w3school!

Example 2

In this example, we will perform a global substitution, and whenever "Microsoft" is found, it is replaced with "W3school":

<script type= "Text/javascript" >var str= "Welcome to microsoft! "Str=str +" We are proud to announce that Microsoft have "Str=str +" one of the largest WEB developers sites in the world. " document.write ( str.replace(/Microsoft/g, "W3School") ) </script>

Output:

Welcome to w3school! We is proud to announce this W3schoolhas one of the largest WEB developers sites in the world.

Example 3

You can use the code provided in this example to ensure that the matching string is correct for uppercase characters:

Text = "JavaScript Tutorial"; Text.replace (/javascript/i, "JavaScript");

Example 4

In this example, we will convert "Doe, John" to the form of "John Doe":

Name = "Doe, John"; Name.replace (/(\w+) \s*, \s* (\w+)/, "$ $");

Example 5

In this example, we'll replace all the curly quotes with straight quotes:

name = ' A ', "B" '; Name.replace (/"([^"]*) "/g," ' $ ' ");

Example 6

In this example, we will convert all of the words in the string to uppercase in the first letter:

Name = ' aaa bbb ' CCC '; Uw=name.replace (/\b\w+\b/g, function (word) {  return word.substring (0,1). toUpperCase () + Word.substring (1);}  );

JavaScript Replace () method