使用python正则表达式查找特定字符

Question

I have a list of strings looking like this:

H PL->01 Tx=000/006 Ph=00/000  DGDD DDDR YDyD GRDD YGR  Dets=     003,003,003,003,003,003,003,003,003,003,003,003,  ports= 255,255,255,255,255,255,255,255,'

I want to be able to extract the content tha matches DGDD DDDR YDyD GRDD YGR (this changes but always has the letters D,G,R,Y,y and its length may change) and put it in a list without whitespaces like this:

 ['D', 'G', 'D', 'D', 'D', 'D', 'D', 'R', 'Y', 'D', 'y', 'D', 'G', 'R', 'D', 'D', 'Y', 'G', 'R']

Answer 1

If the criteria is groups of DGRYy that have at least three characters, then you can use a regex to that effect and then "flatten" it to a list after... eg:

import re
from itertools import chain
print list(chain.from_iterable(re.findall('[DGRYy]{3,}', data)))
# ['D', 'G', 'D', 'D', 'D', 'D', 'D', 'R', 'Y', 'D', 'y', 'D', 'G', 'R', 'D', 'D', 'Y', 'G', 'R']

If it's always between two items, then it's possible to use the builtin string functions to extract it, eg:

print [ch for ch in data[data.index('Ph'):].partition('Dets=')[0].split(' ', 1)[1] if ch != ' ']