How to convert 3-digit HTML hex colors to 6-digit flex hex colors

Question

I want to convert a three-digit hex color which is coming from HTML CSS to a six-digit hex color for Flex. Can anyone give me code to convert 3-digit hex colors to their 6-d

Answer 1

Kotlin version of Ovokerie's answer:

shortHexString.replace(Regex("#([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])"), "#$1$1$2$2$3$3")