The case of JS regular RegExp judging whether a text box contains special symbols

This article is about the case of JS regular RegExp determining whether a text box contains special symbols. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Preface

Sometimes we want to determine whether the characters entered by the user in the text box contain special symbols (* / # $@), just as the password box is filled in when the user registers.

Demo

The above requirements can be realized gracefully by using the RegExp object:

/ / even (text box content) function (even) {/ / Rule object (flag) var flag = new RegExp ("[`~! @ # $^ & * () = | {}':;',\ [\]." /? ~! @ # ¥. & * ()-| {} []';: "'. , 、? ] ") / / determine whether even contains the special character if (flag.test (even)) {console.log ('include!') } else {console.log ('not included!') }}

There are many other special characters in the flag rule object, and the demo here is sufficient. For example, you can add other special characters as required by the project.

Another way

Js regularization determines whether it contains special symbols.

Function chack_name (str) {var pattern = new RegExp ("[`~! @ # $^ & * () = | {}':;',\ [\]." /? ~! @ # ¥. & * ()-- | {} []';: ",?]"); if (pattern.test (str)) {return true;} return false;} thank you for reading! This is the end of this article on "the case of JS regular RegExp judging whether the text box contains special symbols". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!