validcharacters
nounUK /ˈvælɪd ˈkærəktəz/
US /ˈvælɪd ˈkærəktərz/
Valid characters are the letters, numbers, or symbols that a computer is allowed to use.
The password box only accepts valid characters like letters and numbers.
OTHER MEANINGS
2. The characters that are allowed in a specific text field or form.
Please type only valid characters in the name field.
3. Characters that meet the rules of a programming language or file format.
The code failed because it contained invalid characters instead of valid characters.
4. Letters, digits, and symbols that a system can read correctly.
Make sure your username uses valid characters so the system can save it.