使用python仅从文本中提取指定值[重复]答案

【问题标题】：extracting only the specified value from text using python [duplicate]使用python仅从文本中提取指定值[重复]
【发布时间】：2018-07-16 22:06:12
【问题描述】：

我有一个包含如下数据的文本文件。我必须提取所有包含签名的行

The document was signed on July 12

The document was signed by Charlie

This document was assigned to John

The document was preassigned to Amanda

预期输出：

The document was signed on July 12

The document was signed by Charlie

如果我正在使用：

for line in file:
    if "signed" in line:
        print (line)

正在打印所有行

【问题讨论】：

【解决方案1】：

这很容易通过使用单词边界\b 来完成。 \bsigned 将匹配已签名，但未分配。

你可以使用re.search(line, ".*\bsigned.*")

【讨论】：