How to use jsreplace function

The replace() function in JavaScript is used to replace certain characters with other characters in a string. This function can accept two parameters, the first parameter can be a string or a regular expression, and the second parameter can be a string or a function.

1. Use a string as the first parameter:

In this case, the replace() function will use the string provided by the second parameter to replace the first parameter. Matching parts.

let str = 'Hello World';  
let newStr = str.replace('World', 'JavaScript');  
console.log(newStr);  // 输出: 'Hello JavaScript'

2. Use a regular expression as the first parameter:

If you use a regular expression as the first parameter, the replace() function will use the characters provided by the second parameter. String or function to replace all matching parts.

Use a string as the second parameter:

let str = 'Hello World, Hello JavaScript';  
let newStr = str.replace(/World/g, 'JavaScript');  
console.log(newStr);  // 输出: 'Hello JavaScript, Hello JavaScript'

In this example, /World/g is a regular expression, and the g flag indicates a global search, that is, finding all matching parts.

Use a function as the second parameter:

let str = 'Hello World, Hello JavaScript';  
let newStr = str.replace(/World/g, function(matched) {  
    return 'JavaScript';  
});  
console.log(newStr);  // 输出: 'Hello JavaScript, Hello JavaScript'

In this example, the function accepts one parameter (in this case the matched string) and returns the string to be replaced.

Note: If the string contains special characters (such as $, ^, *, etc.), you need to use two slashes (\\) to escape when used as a regular expression. For example: 'Hello $'.replace(/\$/g, 'Java') will output 'Hello Java'.

The above is the detailed content of How to use jsreplace function. For more information, please follow other related articles on the PHP Chinese website!