提取子从字符串在Python

我有一个字符串，它看起来像这样：提取子从字符串在Python

catString = randomtextrandomtext (cats:1)=1 randomtext randomtextrandomtext (cats:3)=3 randomtext randomtext (cats:1540)=1,540 randomtextrandomtext randomtext (cats:85):85 randomtext

我想打印出一个字符串，看起来像这样：

(cats:1)(cats:3)(cats:1540)(cats:85)

我试图做：

catCount = '' 

for a in catString: 
    for b in line.split(): 
     if '(cats:' in b: 
      catCount += str(part) 
print catCount

然而，该代码打印出：

(cats:1)=1(cats:3)=3(cats:1540)=1,540(cats:85)=85

我该如何达到自己想要的效果？

来源

2016-02-20 Helloimjs0n

使用str.index特别。

catString = "randomtextrandomtext (cats:1)=1 randomtext randomtextrandomtext (cats:3)=3 randomtext randomtext (cats:1540)=1,540 randomtextrandomtext randomtext (cats:85):85 randomtext" 

result = '' 
end = -1 
try: 
    while True: 
     start = catString.index('(cats:', end+1) 
     end = catString.index(')', start) 
     result += catString[start:end+1] 

except ValueError: 
    pass 

print(result)

来源

2016-02-20 02:34:17

试试这个开始参数一旦

catCount = '' 

for a in catString: 
    for b in line.split(): 
     if '(cats:' in b: 
      catCount += str(b[0,b.index(")")+1]) 
print catCount

来源

2016-02-20 02:32:04

import re 

''.join(re.findall(r'\(cats:\d*\)', catString))

来源

2016-02-20 02:37:42 helloV

>>> ''.join(re.findall('\(cats:[0-9]+\)',catString)) 
'(cats:1)(cats:3)(cats:1540)(cats:85)'

来源

2016-02-20 02:40:34

提取子从字符串在Python

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