afv-library/skills/creating-sf-skill/examples/simple-metadata-skill/references/formula_patterns.md

Common Validation Rule Formula Patterns

Required field (non-blank)

ISBLANK(Field__c)

Error: "Field is required."

Required field only on specific record type

AND(
  RecordType.DeveloperName = "Enterprise",
  ISBLANK(Field__c)
)

Numeric range check

OR(
  Amount__c <= 0,
  Amount__c > 1000000
)

Error: "Amount must be between 1 and 1,000,000."

Date must be in the future

Close_Date__c <= TODAY()

Error: "Close date must be after today."

Date comparison (end after start)

End_Date__c <= Start_Date__c

Error: "End date must be after start date."

Field changed validation (update only)

AND(
  NOT(ISNEW()),
  ISCHANGED(Stage__c),
  ISPICKVAL(PRIORVALUE(Stage__c), "Closed Won")
)

Error: "Cannot change stage after Closed Won."

Bypass with Custom Permission

Wrap any formula to allow admin bypass:

AND(
  NOT($Permission.Bypass_Validation_Rules),
  {your formula here}
)

Regex pattern match (email format)

NOT(REGEX(Email__c, "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$"))

Cross-field dependency

AND(
  ISPICKVAL(Type__c, "Partner"),
  ISBLANK(Partner_Account__c)
)

Error: "Partner Account is required when Type is Partner."