如何删除字符串中不包含指定单词:tesTWORD:的所有行？

以下是几种不同场景下的实现方式，均能精准保留包含:tesTWORD:子串的行，剔除其他行：

Python 实现 #

将原字符串按行拆分，过滤出包含目标子串的行后重新拼接：

original_str = '''"111"1"13648""
PA4123:tesTWORD:a6b4ba21ba54f6bde411930bd864b700"""""
"101"1"00000368""
PA1239:tesTWORD:a6b4ba21ba54f6bde411930b0001cb9d"""
PA0545:tesTWOR:b598944d1ba4c787e411800b8043559c""
""
PA1238:tesTWORD:a6b4ba21ba54f6bde411920b6ba5f90b
PA0545:tesWOR:b598944d1ba4c787e411800b8043559c""
3646475'''

# 分割行 → 过滤目标行 → 拼接结果
filtered_lines = [line for line in original_str.splitlines() if ':tesTWORD:' in line]
result = '\n'.join(filtered_lines)

print(result)

Shell 环境实现 #

使用grep命令直接匹配目标子串，适用于处理文件或字符串变量：

• 处理文件（假设文件名为input.txt）：

grep ':tesTWORD:' input.txt

• 处理字符串变量：

original_str='"111"1"13648""
PA4123:tesTWORD:a6b4ba21ba54f6bde411930bd864b700"""""
"101"1"00000368""
PA1239:tesTWORD:a6b4ba21ba54f6bde411930b0001cb9d"""
PA0545:tesTWOR:b598944d1ba4c787e411800b8043559c""
""
PA1238:tesTWORD:a6b4ba21ba54f6bde411920b6ba5f90b
PA0545:tesWOR:b598944d1ba4c787e411800b8043559c""
3646475'
echo "$original_str" | grep ':tesTWORD:'

JavaScript 实现 #

通过拆分字符串、过滤行、重新拼接完成处理：

const originalStr = `"111"1"13648""
PA4123:tesTWORD:a6b4ba21ba54f6bde411930bd864b700"""""
"101"1"00000368""
PA1239:tesTWORD:a6b4ba21ba54f6bde411930b0001cb9d"""
PA0545:tesTWOR:b598944d1ba4c787e411800b8043559c""
""
PA1238:tesTWORD:a6b4ba21ba54f6bde411920b6ba5f90b
PA0545:tesWOR:b598944d1ba4c787e411800b8043559c""
3646475`;

const filteredLines = originalStr.split('\n').filter(line => line.includes(':tesTWORD:'));
const result = filteredLines.join('\n');

console.log(result);

内容的提问来源于stack exchange，提问作者user20432127