Simple and practical examples of JavaScript regular expressions

var user='xia&amp;&amp;min**';
user=(/[^A-Za-z\d_-]+/,'');   //Add value again(user); //xiamin**
user = (/[^A-Za-z\d_-]+/g, '');  //Replace globally(user); //xiamin

Split email

var email='nettuts@';
var result=(/([A-Za-z_\d-]+)@([A-Za-z_\d-]+)\.[a-z]{2,4}/ig,'$1,$2');
(result); //nettuts tutsplus

This method takes a single string parameter and returns a Boolean value indicating whether a criticism was found. If you don't need to operate on specific matching results, for example, verifying the username, the "test" method is enough to complete this task.

var name='xiamin';
var result=/[A-Za-z-_]+/.test(name);
(result);

Unlike the test method, match() returns an array containing all the found criticisms.

var name='xiamin';
var result=(/i/g);
(result); //(2) ["i", "i"]

Match all before and after question marks

var url ='http://localhost:8080?name=xiamin';
var result=(/^(.+)\?(.+)/i);
(result);//"http://localhost:8080?name=xiamin?" "http://localhost:8080" "name=xiamin"

Match the content after #

var url ='http://localhost:8080?name=xiamin#dnsjdnw';
var result=(/#(.+)/i);
(result);//"#dnsjdnw", "dnsjdnw"

Obtain the Agreement

var url ='http://localhost:8080?name=xiamin#dnsjdnw';
var result=(/(ht|f)tps?:/i);
(result);//"http:", "ht"

Match the page url

var url ='';
var result=(/.+\.[a-z]{2,4}/ig);
(result);//

The above is a simple and practical example of JavaScript regular expressions introduced to you by the editor. I hope it will be helpful to you. If you have any questions, please leave me a message and the editor will reply to you in time. Thank you very much for your support for my website!