# Matches an ANSI 8-bit color
(?-i)\e                                                    # An Escape
\[                                                         # Followed by a bracket
(?>
  (?<IsForegroundColor>38)  |
  (?<IsBackgroundColor>48)  |
  (?<IsUnderlineColor>58));5;(?<Color>(?>
  (?<StandardColor>[0-7])                                  # 0 -7 are standard colors
m  |
  (?<BrightColor>(?>[8-9]|1[0-5]))                         # 8-15 are bright colors
m  |
  (?<CubeColor>(?>[0-2][0-3][0-1]|[0-1]\d\d|\d{1,2}))      # 16-231  are cubed colors
m  |
  (?<GrayscaleColor>(?>[0-2][0-5][0-5]|[0-1]\d\d|\d{1,2})) # 232-255 are grayscales
m))