A js mobile phone number verification regular expression that is prone to errors (recommended)

Write a simple regular expression to verify the 11-digit mobile phone number. The beginning is 13, 15, 18. I wrote it like this at the beginning:

var reg = /^(13[0-9]{9})|(15[0-9]{9})|(18[0-9]{9})$/;

Running found that even 13988888877157777 can pass the verification, which means that the writing method is wrong. My original intention is to hope this:

 ^(13[0-9]{9})$ or ^(15[0-9]{9})$ or ^(18[0-9]{9})$

So the correct way to write it is:var reg = /^1[358][0-9]{9}$/;This will ensure 11 digits

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