Write a regular expression to match a hexadecimal color code (e.g., #FFFFFF).
Added by Kimberly K.
Step 1
- It starts with a `#` symbol. - Followed by exactly 6 hexadecimal digits (0-9, A-F, a-f). Show more…
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Write regular expression for a string with odd number of 1s and odd number of 0s.
Akash M.
A common use of hexadecimal numerals is to specify colors on web pages. Every color has a red, green, and blue component. In decimal notation, these are denoted with an ordered triple $(x, y, z),$ where $x, y,$ and $z$ are the three components, each an int from 0 to $255 .$ For example, a certain shade of red, whose red, green, and blue components are $238,9,$ and $63,$ is represented as (238,9,63) In hexadecimal, a color is represented in the format $\# \mathrm{RRGGBB}$, where $\mathrm{RR}$, GG, and BB are hex values for the red, green, and blue. Using this notation, the color (238,9,63) would be coded as #EE093F. Which of the following hex codes represents the color (14,20,255)$?$ (A) $\# 1418 \mathrm{FE}$ (B) #OE2OFE (C) #OE14FF (D) #OFE5FE (E) #OD14FF
Colors in HTML (the language in which many web pages are written) can be represented by six-digit hexadecimal codes: sequences of six integers ranging from 0 to 15 (represented as $0, \ldots, 9, \mathrm{~A}, \mathrm{~B}, \ldots, \mathrm{F})$ a. How many different colors can be represented? b. Some monitors can display only colors encoded with pairs of repeating digits (such as $44 \mathrm{DD} 88$ ). How many colors can these monitors display? c. Grayscale shades are represented by sequences $x y x y x y$ consisting of a repeated pair of digits. How many grayscale shades are possible? d. The pure colors are pure red: $x y 0000$; pure green: $00 x y 00$; and pure blue: $0000 x y .(x y=F F$ gives the brightest pure color, while $x y=00$ gives the darkest: black.) How many pure colors are possible?
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