Oracle ADF - Regular Expression and Attribute validation Notes

Regular Expression for Email validation

[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}

if you want to put this for optional field then we have to allow null/empty values as well

So the above expression becomes

^$|^([A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4})$

^ begin of the string

$ is end of String

| is OR

Regular Expression for Alphanumeric character and also '_' (UnderScore) is allowed

[a-z A-Z 0-9 _]

Regular Expression for Number validation(Only Numbers are allowed not Decimals like 1.5)

[0-9]{1,10}|null

| -> OR

null -> the input text allows null values as well

Attribute validation 

We can perform attribute validation using <af:validateRegExp> component

For Ex, If input text is allowed to have only alphanumeric then put following <af:validateRegExp> within af:inputText component

<af:validateRegExp messageDetailNoMatch="Only alphanumeric, '_'(Underscore) and '-'(Hyphen) characters are allowed" pattern="[a-z A-Z 0-9]*"/>