Python Re.Sub 函数使用问题

Question

我需要有关此 re.sub 功能的帮助。例如，如果我想用“abc”替换“string” 但我希望 #include <string.h> 保持不变，这样语法就不会受到干扰，所有其他“字符串”变量都将替换为“abc”。如何编写 re.sub 函数？

Python代码是：

result = re.sub("string","abc", test_str, 0)

test_str是这个

#include <string.h>
#include <stdlib.h>

char *Function(unsigned char *string, unsigned char *key)
{
unsigned int i, j;

for (i = 0; i < s(string); i++)
{
    
    string[i] = ~ string[i];
}

return string;
}

Answer 1

使用

result = re.sub(r"\bstring\b(?!\.h\b)", "abc", test_str)

见proof

说明

--------------------------------------------------------------------------------
  \b                       the boundary between a word char (\w) and
                           something that is not a word char
--------------------------------------------------------------------------------
  string                   'string'
--------------------------------------------------------------------------------
  \b                       the boundary between a word char (\w) and
                           something that is not a word char
--------------------------------------------------------------------------------
  (?!                      look ahead to see if there is not:
--------------------------------------------------------------------------------
    \.                       '.'
--------------------------------------------------------------------------------
    h                        'h'
--------------------------------------------------------------------------------
    \b                       the boundary between a word char (\w)
                             and something that is not a word char
--------------------------------------------------------------------------------
  )                        end of look-ahead

Python Re.Sub 函数使用问题

Python Re.Sub Function Usage Issue

python

regex

syntax

substitution