Function OnlyContains

OnlyContains(str: string, ...characters: string[]): boolean
Determines whether the given string consists only of the specified characters.
Parameters
- str: string
  The string to check.
- ...characters: string[]
  The list of allowed characters. The string is valid only if every character in str is present in this list.
Returns boolean
true if str contains only the specified characters or is empty; otherwise, false.
Remarks
- The function removes duplicate characters from the characters list before checking.
- If str is empty, the function returns true.
Since
4.0.0

Version
2025-07-09
- Defined in string/OnlyContains.ts:50