How to Remove ANSI Escape Sequences from Strings in Python?

Removing ANSI Escape Sequences from a String in Python

In Python, ANSI escape sequences can pose a hindrance when working with strings returned from SSH commands. These sequences, used for formatting and cursor control, can disrupt the readability and functionality of the string. To address this issue and extract the desired text, let's explore a solution using regular expressions.

The following Python snippet demonstrates how to remove ANSI escape sequences from a string:

import re

# Regex to capture ANSI C1 escape sequences
ansi_escape = re.compile(r'\x1B(?:[@-Z\-_]|\[[0-?]*[ -/]*[@-~])')

# Replace escape sequences with an empty string
result = ansi_escape.sub('', string_with_ansi_sequences)

The ansi_escape regular expression targets both 7-bit and 8-bit C1 ANSI escape sequences. It captures sequences that start with the escape character (x1B) followed by either a control sequence (e.g., [@-Z\-_]) or a control sequence introduced by [. The sub() method then replaces all matches with an empty string, effectively removing the escape sequences.

For instance, the following input string:

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

would be transformed into:

'ls\r\nexamplefile.zip\r\n'

This method allows you to remove ANSI escape sequences and retrieve the desired text from strings returned from SSH commands, enabling you to work with the extracted text without formatting interference.

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