In the second method, we will use a regex expression to detect whether an input string

$$colourValue$$ is a valid representation of a hexadecimal colour value. A hexadecimal

colour value should be of the format: $0$xRRGGBB$,$ where RR$,$ GG and BB are two digit

hexadecimal values $($i$.$e$.$ that have two digits that are each either a number $0-9,$ or the letters

a$,$b$,$c$,$d$,$e$,$f$).$

The colour can include capital or lowercase letters. The method should return a boolean

indicating true if the colour format is a valid hexadecimal colour, or false otherwise.