Top Forums UNIX for Beginners Questions & Answers Filter valid hexadecimal color codes Post 303045967 by sean96 on Monday 20th of April 2020 10:34:46 AM
Old 04-20-2020
So I think I found out a good way of doing it by using grep and regular expression to filter out the non-valid codes but it doesn't seem to work and I don't know why

grep "^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})" colours.txt


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XParseColor()															     XParseColor()

  XParseColor - look up RGB values from ASCII color name or translate hexadecimal value.

  Status XParseColor(display, colormap, spec, exact_def_return)
	Display *display;
	Colormap colormap;
	char *spec;
	XColor *exact_def_return;

  display   Specifies a connection to an X server; returned from XOpenDisplay().

  colormap  Specifies a colormap associated with the screen on which to look up the color.  This argument is required, but is meaningful only
	    with Xcms color specifications.

  spec	    Specifies the color string (see the "Description" section).  Uppercase or lowercase does not matter.  If the color name is not in
	    the Host Portable Character Encoding, the result is implementation-dependent.

	    Returns  the  RGB values corresponding to the specified color name or hexadecimal specification, and sets its DoRed, DoGreen, and
	    DoBlue flags.

  Zero on failure, non-zero on success.

  XParseColor() looks up the string name of a color with respect to the screen associated with the specified colormap.	It returns the	exact
  color value.	It or hexadecimal values specified, or translating the hexadecimal code into separate RGB values.

  XParseColor() takes a string specification of a color, typically from a user-specified command line or resource value, and returns the cor-
  responding red, green, and blue values, suitable for a subsequent call to XAllocColor or XStoreColor().   spec  can  be  given  in  several
  forms, and may be looked up in different ways depending on the form.

  o  Color name, such as "blue".  This form is looked up in the server's RGB database, a sample of which is listed in Appendix D, The Server-
     side Color Database.

  o  Xcms color name, such as TekHVC:0.0/100.0/0.0.  This form is looked up in the client-side database for the screen	associated  with  the
     specified	colormap.   This  form is supported starting in Release 5.  For more information on this form of color specification, see the
     Programmer's Supplement for Release 5, or the Third Edition of Volume One.

  o  Hexadecimal specification such as #3a7.  This form consists of an initial sharp sign character followed by one of the following formats:

	#RGB   (one character per color)
	#RRGGBB   (two characters per color)
	#RRRGGGBBB   (three characters per color)
	#RRRRGGGGBBBB	(four characters per color)

     where R, G, and B represent single hexadecimal digits (uppercase or lowercase).  The hexadecimal strings must be NULL-terminated so that
     XParseColor()  knows  when it has reached the end.  When fewer than 16 bits each are specified, they represent the most significant bits
     of the value.  For example, #3a7 is the same as #3000a0007000.  The hexadecimal style is discouraged in Release 5 and later.

  Status is zero on failure, non-zero on success.  This routine will fail if the initial character is a sharp sign but the  string  otherwise
  fails  to  fit one of the above formats, or if the initial character is not a sharp sign and the named color does not exist in the server's

  For more information, see Volume One, Chapter 7, Color and in the Third Edition, the chapter on Device-Independent Color.

     typedef struct {
	 unsigned long pixel;
	 unsigned short red, green, blue;
	 char flags;	/* DoRed, DoGreen, DoBlue */
	 char pad;
     } XColor;

  BadColor  Invalid colormap.

See Also
  XBlackPixel(), XWhitePixel(), XAllocColor(), XcmsAllocColor(), XAllocColorCells(), XAllocColorPlanes(), XAllocNamedColor(), XcmsAllocNamed-
  Color(),  XFreeColors(), XLookupColor(), XQueryColor(), XQueryColors(), XStoreColor(), XcmsStoreColor(), XStoreColors(), XcmsStoreColors(),

Xlib - Color Cells														     XParseColor()

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