How to parse data with fixed length but no separators

[tjwang]

My data is a big plain text file with multiple sections with definite lengths but no separators like below

"aabb111222Test ABC20080502
ccdd333444Test EFG20080503
......"

The first section has length 4, such as "aabb" or "ccdd";
The second section has length 6, such as "111222" or "333444";
The third section has length 8, such as "Test ABC" or "Test EFG";
The forth section has length 8 as a date, such as "20080502" or "20080503";
and so on...

What filters or patterns can be used to parse the data like this?

Many thanks,

[Badger]

@tjwang

ccdd333444Test EFG20080503

grok { match => [ "message", "^(?<f1>.{4})(?<f2>.{6})(?<f3>.{8})(?<f4>.{8})"] }

will do it.

[tjwang]

Excellent. This works perfectly for me.

Thanks,