python 在字符串中查找子字符串

Question

我是 python 的新手，我对下面的代码有一些简单的问题代码应该给出结果 'x100' 而它是 'x10' 和 'x100'。如何获得预期的结果。

test_list=['x10','x50','x100']
text='this text has x100 only'
for i in test_list:
    if  text.find(i)!=-1:
        print "found "+i 
>>> 
found x10
found x100
>>>

Answer 1

更简单的方法是

test_list=['x10','x50','x100']
text='this text has x100 only'
for i in test_list:
    if  i in text.split():
        print "found "+i

检测

test_list=['x10','x50','x100']
test_list= sorted(test_list,key = lambda x: len(x), reverse = True)
text='this text has x100n only'
import re
a = re.search("|".join(test_list),text)
if a:
    print "Found",a.group()

Answer 2

您可以使用 .split() 来查找它是否在单词列表中：

>>> test_list=['x10','x50','x100']
>>> text='this text has x100 only'
>>> for i in test_list:
...   if i in text.split():
...     print "found",i
...
found x100

Answer 3

您可以使用这个简单的列表理解来查找所有实例。奖励：它只计算一次拆分。

def f(s, lst):
    return [item for item in lst if item in s.split()]

测试一下：

>>> test_list=['x10','x50','x100']
>>> text='this text has x100 only'
>>> f(text, test_list)
['x100']

python 在字符串中查找子字符串

python to find sub string inside string

python

python-2.7