Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues.
• Refer to the FAQ.
• Refer to Differences between Windows PowerShell 5.1 and PowerShell.

Steps to reproduce

"`e[m " is a valid ANSI escape sequence that resets current formatting, short for "`e[0m "

The StringDecorated currently doesn't recognize it, and retains it as part of the data when plain-text conversion is requested.

# If you output the string directly to the terminal, you'll see that the trailing "." is NOT green anymore,
# proving that "`e[m"` was effective in resetting the color.
([System.Management.Automation.Internal.StringDecorated]::new("`e[32mgreen`e[m.")).ToString('PlainText') | Format-Hex

Note:

• Because terminals recognize "`e[m " correctly, the problem is usually hidden when the class is used behind the scenes in conjunction with $PSStyle.OutputRendering = 'PlainText', e.g. with
  $PSStyle.OutputRendering = 'PlainText'; wsl -e printf '\e[32mgreen\e[m.' | Out-Host.

• However, due to the - inappropriately closed - Streamed executable output prints Ansi Escaping in Write-* Commandlets #18771 - it currently does surface in conhost.exe windows on Windows.

Expected behavior

Label: String (System.String) <7E780A95>

          Offset Bytes                                           Ascii
                 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
          ------ ----------------------------------------------- -----
0000000000000000 67 72 65 65 6E 2E                               green.

Actual behavior

Label: String (System.String) <56784E4B>

          Offset Bytes                                           Ascii
                 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
          ------ ----------------------------------------------- -----
0000000000000000 67 72 65 65 6E 1B 5B 6D 2E                      green�[m.

Note the extraneous �[m part in the Ascii column, showing that `e[m was unexpectedly retained.

Error details

No response

Environment data

PowerShell Core 7.4.0-preview.1

Visuals

No response