Example 1 : Validate Credit Card Number
Description :

Validates that a custom text field called Credit_Card_Number is formatted in 9999-9999-9999-9999 or 9999999999999999 number format when it is not blank.The pattern specifies:
• Four digits (0-9) followed by a dash: \\d{4}-
• The aforementioned pattern is repeated three times by wrapping it in () {3}
• Four digits (0-9)
• The OR character (|) allows an alternative pattern of 16 digits of zero through nine with no dashes: \\d{16}
Validation Formula :
NOT( REGEX( Credit_Card_Number__c ,  “(((\\d{4}-){3}\\d{4})|\\d{16})?”))  
Error Message : Credit Card Number must be in this format: 9999-9999-9999-9999 or 9999999999999999.

Example 2 : Valid IP Address
Description :
Ensures that a custom field called IP Address is in the correct format, four 3-digit numbers (0-255) separated  by periods.

Validation Formula :

REGEX( IP_Address__c, 
Error Message : IP Address must be in form 999.999.999.999 where each part is between 0 and 255.

Example 3 : US Phone Number Has Ten Digits
Description :
Validates that the Phone number is in (999) 999-9999 format. This works by using the

REGEX function to check that the number has ten digits in the (999) 999-9999 format.

Validation Formula : 

NOT(REGEX(Phone, “\\D*?(\\d\\D*?){10}”))  
Error Message : US phone numbers should be in this format: (999) 999-9999.

Example 4 : Social Security Number Format
Description :
Validates that a custom text field called SSN is formatted in 999-99-9999 number format

(if it is not blank). The pattern specifies:
• Three single digits (0-9):\\d{3}
• A dash
• Two single digits (0-9):\\d{2}
• A dash
• Four single digits (0-9):\\d{4}

Validation Formula :

LEN (Social_Security_Number__c) = 0, 
REGEX( Social_Security_Number__c , “[0-9]{3}-[0-9]{2}-[0-9]{4}”) 

 Error Message : SSN must be in this format: 999-99-9999.

Written by 

I am Sakthivel Madesh, a certified Salesforce Advanced Developer & Administrator working on Salesforce Technology since 2011. I am currently working in Techforce Services as Sr. Salesforce Developer. I have worked on multiple technologies Like PHP, Java, Salesforce, I am very passionate about Salesforce and to earn 15x Salesforce Certification. I love Trailhead for learning Salesforce Skill and Become a Trailhead 5x Ranger too. I Love to Learn & Share my Salesforce knowledge to Salesforce Learners/Beginner using My Blog and Salesforce Community.

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