Function getHexValue

getHexValue(str): Result<string, Error>
Extracts the hexadecimal value from a string that starts with a "#" character.

Example
```
getHexValue("#ff00ff")
// => { ok: true, value: 'ff00ff' }
```
Example
Handle invalid input:
```
getHexValue("ff0000")
// => { ok: false, error: Error('[colors.getHexValue] Expected a valid hex string') }
```
Parameters
- str: string
  
  The string to extract the hexadecimal value from.
Returns Result<string, Error>
A Result object with either the hexadecimal value as string on success, or an Error object if the provided input is not a string.
- Defined in colors/index.ts:49

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