How Can I Remove ANSI Escape Sequences from Strings in Python?

Removing ANSI Escape Sequences from Strings in Python

When working with strings obtained from SSH commands, you might encounter ANSI escape sequences that interfere with your program's operation. To remove these escape sequences and extract the relevant information from the string, you can employ the following techniques using Python's regular expressions module:

Regular Expression Method

You can use the following regular expression to identify and remove ANSI escape sequences from a string:

import re

# 7-bit C1 ANSI sequences
ansi_escape = re.compile(r'\x1B(?:[@-Z\-_]|\[[0-?]*[ -/]*[@-~])')
result = ansi_escape.sub('', sometext)

This regex targets both 7-bit and 8-bit C1 ANSI escape sequences, including Control Sequence Introducers (CSI) and Select Graphic Rendition (SGR) codes.

Example

Consider the following string with ANSI escape sequences:

'ls\r\n\x1b[00m\x1b[01;31mexamplefile.zip\x1b[00m\r\n\x1b[01;31m'

Applying the above regex will remove the escape sequences, leaving you with:

ls\r\nexamplefile.zip\r\n

Explanation of the Regular Expression

• x1B: Matches the ASCII code for the Escape character (ESC).
• [@-Z\-_]: Matches 7-bit C1 escape sequences that are not CSI.
• [[0-?]*[ -/]*[@-~]: Matches CSI escape sequences.
• `?*: Matches zero or more occurrences of the preceding element.
• .*: Matches all characters that come after the escape sequence.

By matching and removing these escape sequences, you can effectively extract the desired text from the string.

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