How to check whether the username is valid or not?

Question

Hello, 
 Is there a way to check whether the user name is valid or invalid?

John M · Answer

in which way are you asking whether it is valid or not? 
 
There is a function isusernametaken that will tell you if a username has already been used. One of the shortfalls is that it is case-sensitive. 
 
If you want to know if the string of characters is correct, the Add User Smart Service only allows you to enter a username containing letters, numbers, and the special characters: @ . _ -

vimalkumars · Answer

You can use isusernametaken function. 
 
 As the above function is case-sensitive, below expression helps to find the case-insensitive, 
 if(
 isusernametaken(
 ri!user
 ),
 true,
 or(
 a!forEach(
 items: getallusers(
 1,
 - 1
 ),
 expression: lower(
 ri!user
 ) = lower(
 fv!item
 )
 )
 )
) 
 
 Also. there is one more function isuseractive() to check whether the user is active. 
 
 Function- getAllUsers() is custom function available as part of People Functions Plugin.

sonalim8234 · Answer

Hi, 
 
You can go with the following code: 
 
load( 
 local!isValid: isusernametaken( 
 ri!UserName 
 ), 
 local!isActive: if( 
 or( 
 local!isValid 
 ), 
 isuseractive( 
 ri!UserName 
 ), 
 false() 
 ), 
 if( 
 and( 
 local!isActive, 
 local!isValid 
 ), 
 ri!UserName, 
 null 
 ) 
)

rakshandad · Answer

If you are creating users through your process model and you want user should be created successfully without any username already exist error then you can simply use isusernametaken() function. or in case in addition with user existence you want to check whether user is active or not then you can use isuseractive() function using if-else as given by sonali