Regular Expression for each header get all data before next header?

Hi,

I'm trying to develop a regular expression to extract records from a page of text designed to be for human readible rather than machine readible.

the general problem is that there is a header and then one or more data lines, followed by another header then more data lines etc. I've generated character class which match the headers and data, but i cannot figure out how to get all the data records which belong to a particular header

i.e. given a file like this

header1
data1
data2
data3
data4
header2
data5
data6

I want the following matches

header1 data1
header1 data2
header1 data3
header1 data4
header2 data5
header2 data6

Hence the problem is, geiven a match to the header character class, match all possible data classes which occur before the next header class match.

I'm sure this can be done, but I cannot figure out how. I tried

(header.).*(data.)

which I though would do half the job but I'm only getting one match?

Regards

Dave