Python–提取两个子字符串之间的字符串

原文:https://www . geesforgeks . org/python-extract-两个子字符串之间的字符串/

给定一个字符串和两个子字符串，编写一个 Python 程序来提取找到的两个子字符串之间的字符串。

输入:test _ str =“Gfg 最适合极客和 CS”，sub 1 =“is”，sub 2 =“and”

输出:最适合极客

解释:极客最好是在 is 和‘and’之间

输入:test _ str =“Gfg 最适合极客和 CS”，sub1 =“适合”，sub2 =“和”

输出:极客

解释:极客介于 for 和‘and’之间

方法#1:使用 指数() + 循环

在这种情况下，我们使用 index()获取两个子字符串的索引，然后使用循环在索引内迭代，以找到它们之间所需的字符串。

Python 3

# Python3 code to demonstrate working
# of Extract string between 2 substrings
# Using loop + index()

# initializing string
test_str = "Gfg is best for geeks and CS"

# printing original string
print("The original string is : " + str(test_str))

# initializing substrings
sub1 = "is"
sub2 = "and"

# getting index of substrings
idx1 = test_str.index(sub1)
idx2 = test_str.index(sub2)

res = ''
# getting elements in between
for idx in range(idx1 + len(sub1) + 1, idx2):
    res = res + test_str[idx]

# printing result
print("The extracted string : " + res)

输出:

The original string is : Gfg is best for geeks and CS
The extracted string : best for geeks 

方法 2:使用 指数() + 串切片

类似于上面的方法，只是使用字符串切片来执行切片任务，以提供更紧凑的解决方案。

Python 3

# Python3 code to demonstrate working 
# of Extract string between 2 substrings
# Using index() + string slicing

# initializing string
test_str = "Gfg is best for geeks and CS"

# printing original string
print("The original string is : " + str(test_str))

# initializing substrings
sub1 = "is"
sub2 = "and"

# getting index of substrings
idx1 = test_str.index(sub1)
idx2 = test_str.index(sub2)

# length of substring 1 is added to
# get string from next character
res = test_str[idx1 + len(sub1) + 1: idx2]

# printing result
print("The extracted string : " + res)

输出:

The original string is : Gfg is best for geeks and CS
The extracted string : best for geeks 

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