Validating if a string is a valid ARGB [duplicate]

For either language, you can use regular expressions to ensure a string matches your expectations. Here are some examples in Typescript and C#.

Typescript

const argbRegex = /^#[0-9a-fA-F]{8}$/;
argbRegex.test("#ffffffff"); // true
argbRegex.test("#gggggggg"); // false

C#

Regex argbRegex = new Regex("^#[0-9a-fA-F]{8}$");
argbRegex.IsMatch("#ffffffff"); // True
argbRegex.IsMatch("#gggggggg"); // False

Since you didn't mention it in your question, there are some things that you might want to consider that I did not cover:

• Should a 3 character RGB string be a valid ARGB string?
• Should a 6 character RGB string be a valid ARGB string?
• Do you strictly require the # symbol?
• Do you need to extract the decimal values for each ARGB component?

However, if all you need to do is validate the string is strictly in the 8 characters ARGB format, the above examples will work ok.