Free text mapping

I need to transform content of a file with the structure as follow

<b>Name</b> [tab] Name1

<b>Name</b> [tab] Name2

....

<b>Name</b> [tab] Name3

<b>Group</b> [tab] Group11 [tab] Group12

<b>Group</b> [tab] Group21 [tab] Group22

<b>Group</b> [tab] Group31 [tab] Group32 [tab] Group33

....

Note: [tab] = '0x09'.

With this kind of structure, what type of mapping should I use?

Can I use message mapping, or need to use Java mapping or other type?

Thanks