Regex expression to validate maximum 5 email address separated by comma-CodePudding

I have a input text field to enter maximum of 5 email address seprated by comma, but there I should validate each email address and also validate if there less than 4 comma on that text. How do we write in single regex expression. I have done this :

[RegularExpression("^(\[\\w -.%\] @\[\\w.-\] \\.\[A-Za-z\]{2,4})(,\[\\w -.%\] @\[\\w.-\] \\.\[A-Za-z\]{2,4})\*$", 
ErrorMessage = "Please enter a valid email seprated by comma")\]

public string BCCEmailList { get; set; }

This will validate email address but allows user to enter any number of email seprated by comma.

answer to solve this problem

CodePudding user response：

I found the answer while trying to combine two regular expression.

[RegularExpression("^([\w -.%] @[\w.-] \.[A-Za-z]{2,4})(,[\w -.%] @[\w.-] \.[A-Za-z]{2,4}){0,4}$", ErrorMessage = "Please enter maximum 5 valid email seprated by comma")]

    public string BCCEmailList { get; set; }

CodePudding user response：

First you need to decide on the pattern of the email you want to use, add parantheses around it and add repeat limit afterwards, so it look like:

var myReg = @"^(\w [\w.-_]*@[\w-] \.\w{2,4}[,;]*){1,5}$";