Python正则表达式替换以特定短语开头和结尾的文本

Question

我想替换以<img>开头并以</img>结尾的文本。 我只是从正则表达式开始。

我试过下面的代码。

最终结果应该是：

输入：

"New Year's Eve <img>scr=[...]</img>, New Year's Day (Observed)"

输出：

"New Year's Eve [image placeholder], New Year's Day (Observed)"

代码示例

import re
input = [
    "Independence Day (Observed)",
    "Another Christmas Eve, Christmas Day (Observed)",
    "New Year's Eve <img>scr=[...]</img>, New Year's Day (Observed)",
    "Martin Luther King, Jr. <img>scr=[...]</img> Day"
]
for holiday in input:
    print(re.sub(r'\b<img>\b', '[image placeholder]', holiday))`

Answer 1

您想替换开始和结束标记之间的所有代码：

import re
input = [
    "Independence Day (Observed)",
    "Another Christmas Eve, Christmas Day (Observed)",
    "New Year's Eve <img>scr=[...]</img>, New Year's Day (Observed)"
    "Martin Luther King, Jr. <img>scr=[...]</img> Day"
]
for holiday in input:
    print(re.sub(r'<img>.*?</img>', '[image placeholder]', holiday))

输出：

Independence Day (Observed)
Another Christmas Eve, Christmas Day (Observed)
New Year's Eve [image placeholder], New Year's Day (Observed)
Martin Luther King, Jr. [image placeholder] Day

正则表达式匹配以<img>开头并以</img>结尾的文本以及介于.*?之间的任何内容.*? . ? 使其非贪婪地匹配，以便它匹配直到开始标记之后的第一个结束标记 - 如果同一输入文本中有多个标记，则允许它正确替换每对标记。