How to escape special characters of a string with single backslashes

Question

I’m trying to escape the characters -]^$*. each with a single backslash .

For example the string: ^stack.*/overflow$arr=1 will become:

^stack.*/overflo\w$arr=1

What’s the most efficient way to do that in Python?

re.escape double escapes which isn’t what I want:

'\^stack\.\*\/overflow\$arr\=1'

I need this to escape for something else (nginx).

Asked By: Tom

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Source

Answer 1

This is one way to do it (in Python 3.x):

escaped = a_string.translate(str.maketrans({"-":  r"-",
                                          "]":  r"]",
                                          "\": r"\",
                                          "^":  r"^",
                                          "$":  r"$",
                                          "*":  r"*",
                                          ".":  r"."}))

For reference, for escaping strings to use in regex:

import re
escaped = re.escape(a_string)

Answered By: rlms

Answer 2

Just assuming this is for a regular expression, use re.escape.

Answered By: Ry-

Answer 3

Simply using re.sub might also work instead of str.maketrans. And this would also work in python 2.x

>>> print(re.sub(r'(-|]|^|$|*|.|\)',lambda m:{'-':'-',']':']','\':'\\','^':'^','$':'$','*':'*','.':'.'}[m.group()],"^stack.*/overflow$arr=1"))
^stack.*/overflo\w$arr=1

Answered By: Akshay Hazari

Answer 4

Utilize the output of built-in repr to deal with rnt and process the output of re.escape is what you want:

re.escape(repr(a)[1:-1]).replace('\\', '\')

Answered By: cyining

Answer 5

re.escape doesn’t double escape. It just looks like it does if you run in the repl. The second layer of escaping is caused by outputting to the screen.

When using the repl, try using print to see what is really in the string.

$ python
>>> import re
>>> re.escape("^stack.*/overflo\w$arr=1")
'\\\^stack\\\.\\\*\/overflo\\w\\\$arr\=1'
>>> print re.escape("^stack.*/overflo\w$arr=1")
\^stack\.\*/overflo\w\$arr=1
>>>

Answered By: rjmunro

Answer 6

We could use built-in function repr() or string interpolation fr'{}' escape all backwardslashs in Python 3.7.*

repr('my_string') or fr'{my_string}'

Check the Link: https://docs.python.org/3/library/functions.html#repr

Answered By: Saguoran

How to escape special characters of a string with single backslashes

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