How to match white space with StringRegExp

[john123]

Hi everybody.

Please help me the way to match white space and "?" character with StringRegExp to check a value in input box.

Exam (value in input box):

useraccount ===> valid

user account ===> not valid

or

useracc ount ===> not valid

useraccount? ===> not valid

Thanks very much.

[oMBRa]

$aString = 'useraccount?'
$a = StringRegExp($aString, '[\s?]', 0)
MsgBox(0, '', $a)

[john123]

$aString = 'useraccount?'
$a = StringRegExp($aString, '[\s?]', 0)
MsgBox(0, '', $a)

Thank you so much.