Finally got some idea on Regular expressions with control characters in Teradata..
Sample:-(With One Control Character)
select regexp_replace('BIVT 0','[[:cntrl:]]','|')
It returns BIVT|0 (Tab is replaced with '|')
(With Multiple Control Character)
select regexp_replace('BIVT 0 OK','[[:cntrl:]]','|')
It returns BIVT|0 OK
It works for single occurence,but if my I/P comes with multiple occurence of control characters...How to replace those control characters with '|'???
Finally we arrived at the solution...by using the same function with parameters...
select regexp_replace('BIVT 0 OK','[[:cntrl:]]','|',1,0,'i')
It returns BIVT|0|OK
Venkatesh Kumar Saluvathi