[TxMt] problems with regex

[tandemrepeat]

Hi,

This is not a TextMate problem...rather a user issue but would
appreciate any advice...

I'm trying to set up folding...the file format look like this (FASTA
DNA sequence format) -

>text
agagagtttttttttt...(typically 60chars)
...multiple lines of above, number of lines varies per record
>text2
agagagtcgtttta
.
.
.


Setting foldingStartMarker is easy i.e; (^>) but it's
foldingStopMarker whcih is proving to be tricky.

As I see it, need to match the last line immediately before a new
entry denoted by ^> .

I figure a look-ahead assertion regex is required...something like -

[AGTCagtc]+     # match any string of ACGT
(?=\n^>)            # positive look ahead for new line followed by >

But can't get this or numerous minor variants to work at all...

Any insight greatly appreciated (and apologies if this is an
inappropriate post for the forum)