How to copy field to another

hi all,

I have a field as follows:

FieldNAME: Source | Modified By | Modified Date
DataType: (Code50) | (Code(20) | DateTime
Sample1 : dynmicsusr21 19/01/12 09.01 33PM | |
Sample2: dynmicsusr2119/01/12 05:02 55AM | |

Expected dynmicsusr21 19/01/12 09.01 33PM | dynmicsusr21 | 19/01/12 09.01 33PM
result dynmicsusr2119/01/12 05:02 55AM | dynmicsusr21 | 19/01/12 05:02 55AM

How to achieve it ? Note that Sample1 is with space between UserID and DateTime, Sample2 is with NO space.

The good news is that both belong to same user id.