Python 用变量替换正则表达式包含特殊字符

Question

I'm trying to substitute using re:

buffer = 'my_path: any_suffix'
share_path = '\\\\server\\final'
buffer = re.sub('my_path:.*', fr'my_path: {share_path}', buffer)

In the buffer I get:

'my_path: \\server\x0cinal'

instead of resired:

'my_path: \\server\final'

If I use share_path = '\\\\server\\Final' (with capital 'F') - it works OK.

What can be done?

Answer 1

You need to double escape the backslash in the replacement pattern and it seems the best way to use the variable in this case is to use str.format here rather than the f-string literal ( fr'my_path: {share_path.replace("\\", "\\\\")}' will throw SyntaxError: f-string expression part cannot include a backslash ):

buffer = re.sub('my_path:.*', r'my_path: {}'.format(share_path.replace("\\", "\\\\")), buffer)

See the Python demo .

Answer 2

Code:

buffer.replace('any_suffix', re.sub(r"\\s+", "s", share_path))