正则表达式：从字符串中删除？

Question

字符串输入：readline

预期输出：stream.on

这是我到目前为止无法使用的内容：

Python's Programming: is very easy to learn

如何从Python Programming: is very easy to learn中删除import re mystr = "Python's Programming: is very easy to learn" reg = r'\w+' print(re.findall(reg, mystr)) ？

Answer 1

您提取一个或多个字母数字字符的所有匹配项。

使用

\b's\b

请参见proof。

说明：

--------------------------------------------------------------------------------
  \b                       the boundary between a word char (\w) and
                           something that is not a word char
--------------------------------------------------------------------------------
  's                       '\'s'
--------------------------------------------------------------------------------
  \b                       the boundary between a word char (\w) and
                           something that is not a word char

Python code：

import re
mystr = "Python's Programming: is very easy to learn"
print(re.sub(r"\b's\b", '', mystr))

Answer 2

这里有两个选择。第一个使用正则表达式，第二个使用字符串replace方法。

import re
mystr = "Python's Programming: is very easy to learn"
reg = r"'s"
print(re.sub(reg, '', mystr))
   # prints: Python Programming: is very easy to learn
print(mystr.replace("'s",''))
   # prints: Python Programming: is very easy to learn