What does this POSIX command find in a GREP style

Hello..
I was playing with the POSIX options in the GREP drop down menu and I was wondering what this one did?
[[:space:]]
I assumed it would find any whitespace..but it found nothing?
does anyone know what this command actually finds?
thanks!!
babs

Don't get mixed up in terminology Hexacolor? Presumably you meant Hexachrome®, which is a six colour process system from Pantone, Inc., rather than the standard four colours we all know and love.
That ain't got nothing to do with GREP though.
The xdigit GREP command is only of interest for programmers (and low-level ones at that), as it finds all digits of the hexadecimal system. "Hexadecimal" is like decimal, only more so: after counting from 0 to 9, hex goes on with A, B, C, D, E, and F, and only after that you need to add a digit for "10" (which consequentially stands for the decimal value "16"). The idea is that you can assign a simple value to each set of 4 bits, and because a single byte always consists of 8 bits, you only need two hexadecimal digits to represent any value for a byte, all the way from 0 up to 255.
... About the only use of hexadecimal is in the hard core field of low level programming. I don't think I've ever found [[:xdigit:]] useful in the field of text processing.

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What does this POSIX command find in a GREP style

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