The method used by jquery regular: 1. User password, the code is [/^[a-zA-Z][a-zA-Z0-9_]{5,20}$/]; 2. Mail, the code is [/^ [\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/].
The operating environment of this tutorial: windows7 system, jquery 3.2.1 version, this method is applicable to all brand computers.
Recommendation: jquery video tutorial
jquery regular use method:
1. The creation of regular expression
a) var checkNum = /^[A-Za-z0-9]+$/;
b) var re=new RegExp("["+ s1+"]","g");
2. Common rules
a) User password: /^[a-zA-Z][a-zA-Z0-9_]{5,20}$/
b) Mail:/^ [\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/
c) mobile phone: /^[\d]{5, 20}$/
d) Other commonly used verification: please Baidu
3. Method: test
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Username: Detection
Mailbox: Detection
Mobile phone: detection
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