[libreoffice-users] [Writer] Regular expressions

Hallo everyone.
I would appreciate your help with the regular expressions. I have a 
document consisting of hundreds of lines. A small sample is here:

Set:   01SA34509
0109SA
011017B
01020207B
010902B
01090002
011007B
01090001
090110
Set:   0134501
011101
01110102
01110103
080908
Set:   0111679SE
0111SE

I need to delete all text except these lines started with word "Set". If 
I use "set:.+" regular expression, all these lines, that should be kept, 
are selected. I cant find a way to reverse this selection. I tried 
"[^set:.+].+" and "[^(set:.+)].+" but they don't work. Could you please 
give me any clues? Thanks in advance. Regards,
gordom


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