Replace () method in javascript _ javascript skills

This article mainly introduces the replace () method in javascript. The replace function is to return the replace of strings after text replacement based on regular expressions. For more information, see Definition and usage
The replace () method is used to replace other characters with some characters in a string, or replace a substring that matches a regular expression.
Syntax
StringObject. replace (regexp/substr, replacement)

Return Value
A new string is obtained after the first match of regexp or all matches are replaced by replacement.
Description
The replace () method of the string stringObject performs the search and replace operation. It searches stringObject for substrings that match regexp and replaces them with replacement. If regexp has a global flag, the replace () method replaces all matched substrings. Otherwise, it only replaces the first matched substring.

Replacement can be a string or a function. If it is a string, each match will be replaced by a string. However, the $ character in replacement has a specific meaning. As shown in the following table, it indicates that the string obtained from pattern matching will be used for replacement.

Note:ECMAScript v3 stipulates that the replacement parameter of the replace () method can be a function rather than a string. In this case, each match calls this function, and the string it returns will be used as the replacement text. The first parameter of this function is a matching string. The following parameter is a string that matches the subexpression in the pattern. There can be 0 or more such parameters. The following parameter is an integer that declares the position where the matching occurs in the stringObject. The last parameter is stringObject itself.
Instance
Example 1
In this example, we will replace "Microsoft" in the string with "W3School ":