# Matches an ANSI 24-bit color
(?-i)\e                                                                                # An Escape
\[                                                                                     # Followed by a bracket
(?>
  (?<IsForegroundColor>38)  |
  (?<IsBackgroundColor>48)  |
  (?<IsUnderlineColor>58));2;(?<Color>(?<Red>(?>[0-2][0-5][0-5]|[0-1]\d\d|\d{1,2}))    # Red is the first 0-255 value
;(?<Green>(?>[0-2][0-5][0-5]|[0-1]\d\d|\d{1,2}))                                       # Green is the second 0-255 value
;(?<Blue>(?>[0-2][0-5][0-5]|[0-1]\d\d|\d{1,2}))                                        # Blue is the third 0-255 value
m)