Regex to remove new lines up to a specific character

Question

I have a series of strings in a file of the format:

>HEADER_Text1
Information here, yada yada yada
Some more information here, yada yada yada
Even some more i         


        

Answer 1

you don't have to use regex:

[ x.startswith('>') and x or x.replace('\n','') for x in f.readlines()]    

should work.

In [43]: f=open('test.txt')

In [44]: contents=[ x.startswith('>') and x or x.replace('\n','') for x in f.readlines()]                                                                                   

In [45]: contents
Out[45]: 
['>HEADER_Text1\n',
 'Information here, yada yada yada',
 'Some more information here, yada yada yada',
 'Even some more information here, yada yada yada',
 '>HEADER_Text2\n',
 'Information here, yada yada yada',
 'Some more information here, yada yada yada',
 'Even some more information here, yada yada yada',
 '>HEADER_Text3\n',
 'Information here, yada yada yada',
 'Some more information here, yada yada yada',
 'Even some more information here, yada yada yada']