Validation Rules Examples in Salesforce

If you are looking for validation rule examples then salesforce has shared a list of examples. 

In this post i am sharing list but i will also explain that how we need to write a validation rule. 

Some of the validation rules that I found useful are

• Postal code is in correct format if the country is Canada or US
• State is valid if the country is Canada or US
• Country is a valid 2 letter ISO code
• Number entered is even or odd number
• Number entered is a multiple of another number
• Phone number is in (999) 999-9999 format
• Date entered is a weekday or weekend
• Date entered is the last day of the month
• Conditionally require a field based on the value of other field
• Only the record owner can make changes to a particular field
• Cross object validation rules

References & Useful URLs

• PDF Document – Examples of Validation Rules