Python 正则表达式：在列表中搜索
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Regular Expressions: Search in list
提问by leoluk
I want to filter strings in a list based on a regular expression.
我想根据正则表达式过滤列表中的字符串。
Is there something better than [x for x in list if r.match(x)]?
有比 更好的[x for x in list if r.match(x)]吗？
采纳答案by sepp2k
You can create an iteratorin Python 3.x or a listin Python 2.x by using:
您可以使用以下命令在 Python 3.x 中创建迭代器或在 Python 2.x 中创建列表：
filter(r.match, list)
To convert the Python 3.x iteratorto a list, simply cast it; list(filter(..)).
要将 Python 3.x迭代器转换为列表，只需将其强制转换即可；list(filter(..)).
回答by Mercury
Full Example (Python 3):
For Python 2.x look into Note below
完整示例（Python 3）：
对于 Python 2.x，请查看下面的注释
import re
mylist = ["dog", "cat", "wildcat", "thundercat", "cow", "hooo"]
r = re.compile(".*cat")
newlist = list(filter(r.match, mylist)) # Read Note
print(newlist)
Prints:
印刷：
['cat', 'wildcat', 'thundercat']
Note:
笔记：
For Python 2.x users, filterreturns a list already. In Python 3.x filterwas changed to return an iterator so it has to be converted to list(in order to see it printed out nicely).
对于 Python 2.x 用户，filter已经返回一个列表。在Python 3.x 中filter已更改为返回迭代器，因此必须将其转换为list（以便看到它很好地打印出来）。
