将整行代码（字符串格式）与 Python 正则表达式匹配

Question

使用 Python 和正则表达式，我有一个字符串变量 strSourceCode，其内容如下

'\n function balanceOf(address account) external view returns (uint256);\r\n function transfer(address recipient, uint256 amount) 外部returns (bool) ;\r\n function allowance(address owner, address spender) external view returns (uint256);\r\n function approve(address spender, uint256 amount) 外部 returns (bool );\r\n function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\r'

我想使用 re.findall 例如匹配单词 'allowance' 并且它应该 return 返回以 \n 开头并以 \r 结尾的整行代码，如下所示

'\n 函数 allowance(address owner, address spender) 外部视图 returns (uint256);\r'

我已经苦苦挣扎了几个小时，并决定 post。任何帮助都会很棒！谢谢。

我也试过 re.M 标志，但它似乎不起作用，我肯定做错了什么。

Answer 1

以下正则表达式将查找以“\n”开头、keyword/key 短语前后有任何内容并以“\r”结尾的所有匹配项。

import re
strSourceCode = '\n function balanceOf(address account) external view returns (uint256);\r\n function transfer(address recipient, uint256 amount) external returns (bool);\r\n function allowance(address owner, address spender) external view returns (uint256);\r\n function approve(address spender, uint256 amount) external returns (bool);\r\n function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\r'

what_to_match = 'allowance'
pattern = f'\n .*{what_to_match}.*\r'
matches = re.findall(pattern, strSourceCode)

将整行代码（字符串格式）与 Python 正则表达式匹配

Matching entire line of code (string format) with Python regex

python-3.x

python-re