RegexdrillHex colors
A regex exercise from Regexdrill. Solve it with a pattern box with live highlighting in your browser, checked against hidden test strings, and it is checked the moment you submit.
The task
The whole line must match. Match a CSS hex color: # followed by exactly 3 or exactly 6 hex digits (0 to 9, a to f, either case).
What this exercise teaches
#(?:[0-9a-fA-F]{3}){1,2} repeats a block of three hex digits once or twice.
A hint if you get stuck
Three hex digits, once or twice, gives 3 or 6 but never 4 or 5.
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