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s='aaa111aaa,bbb222,333ccc,444ddd444,555eee666,fff777ggg'

ÓÃÕýÔò±í´ïʽȡ³ö ǰºó×ÖĸÏàͬµÄÊý¾Ý ½á¹ûÈçÏÂ:

111 ddd
лл~
Python code:

import re
s='aaa111aaa,bbb222,333ccc,444ddd444,555eee666,fff777ggg'
p=re.compile(r'(\w)\1{2,}(\w+)(\w)\1{2,}')
m=re.finditer(p,s)
for i in m:
print i.group(2)



Âé·³Äܲ»ÄܽâÊÍһϠÎÒ¸Õ¸ÕÑо¿ÕýÔò±í´ïʽ ¶àл¸ßÈË

(\w)\1{2,}(\w+)(\w)\1{2,} ÓеãСÎÊÌâ
ÐÞÐÞ:
(\w)\1+(\w+)\1{2,}


Â¥Ö÷ûÓбí´ïÈ·È·µÄÒâ˼


"aaa111aaaa" => 111 ?? 111a?? »¹ÊDz»Æ¥Åä??
"aaaa111aaa" => 111 ?? a111?? »¹ÊDz»Æ¥Åä??

r'(\w)\1{2,}(\w+)(\w)\1{2,}' ¿ÉÒÔÓÅ»¯Îª r'(\w)\1{2,}(\w+)\1{3}'
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dddddddddddddddddd

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Python code:
import re
s='aaa111aaa,bbb222,333ccc,444ddd444,555eee666,fff777ggg'
l=s.split(',')
p=re.compile(r'^(?P<balance>\w+)(?P<target>\w+)(?P=balance)$')
for item in l:
m=p.match(item)
if m != None:
print m.group('target')


(r'^(?P<balance>\w+)(?P<target>\w+)(?P=balance)$')<


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