2657415 - Validate if entered values are only numbers for account number or phone number

How to check and validate if entered values are only numbers for account number or phone number?

Employee Central - Personal Information

If we use the regular expression ^[0-9]*$, then when no value is furnished for the field then also the matches() result will become true.

matches() returns true when nothing is entered beacuse of technical limitation in RegEx. The same issue discussed here.

Rule trace:

• Retrieved 'PaymentInformationDetailV3.accountNumber'. Value: ''
• Call function 'matches' with parameters [, ^[0-9]*$]. Result: 'true'

To overcome this behavior and address your requirement of checking if the field always contain numeric values, you can add an if condition which checks for null like below:

Alternately, you can follow format mentioned in KBA - 2421885

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