IS_NUMBER - Check for Valid Number in Informatica

IS_NUMBER checks whether input string is valid number.
Syntax
IS_NUMBER( value )

Example : Check if the values are valid numbers
ITEM_PRICERETURN VALUE
123.001 (True)
-3.45e+31 (True)
''0 (False) Empty string
+123abc0 (False)
ABC0 (False)
-ABC0 (False)
NULLNULL