使用python从文本中仅提取指定的值

Question

我有一个包含以下数据的文本文件。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

Answer 1

使用单词边界\b可以轻松完成此操作。 \ bsigned将匹配已签名，但未分配。

See here

您可以使用re.search(line, ".*\bsigned.*")