Salesforce Validation Rules to validate Email and Phone Number format

Nisar Ahmad April 03, 2019
For Email Address : 

AND( 
     NOT(ISBLANK(Email__c)), 
     NOT(REGEX( Email__c ,'([a-zA-Z0-9_\\-\\.]+)@((\\[a-z]{1,3}\\.[a-z]{1,3}\\.[a-z]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})'))
)

//Error Message : invalid email please enter a valid email address
For Phone Number : 

AND( 
     NOT(ISBLANK(Phone__c)), 
     NOT(REGEX(Phone__c, "\\D*?(\\d\\D*?){10}"))
)

//Error Message : invalid phone number please enter a valid phone number
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