SQL & PL/SQL

Hi All,

I have a string in pl/sql which has 'New line' , 'Form Feed' , 'Carriage Return' , 'Horizontal / vertical Tab space'  and many white space characters.

For eg:

variable1 varchar2(3000);

variable1 = 'Hello world                   hello world

Hello world              Hello world                                      Hello world

Hello world'

I require a query to remove all the spaces(specially it should remove \f,\t,\n,\v,\r) and the string should be looks as below

var 1 = ' Hello world Hello world Hello world Hello world Hello world Hello world '

Please help. Thanks in advance.