Regex validate either empty or only letters

Question

I need to validate an input to be either empty or only contain letters. The letter part I got figured out at ^[a-zA-Z]+$ . How can I accept the input if it's empty too?

Answer 1

Try changing your + to a *, as in this pattern:

^[a-zA-Z]*$

This will match zero or more Latin letters, so it will accept an empty string as well.

For international support, you might also want to consider:

^\p{L}*$

This will match zero or more letters in any Unicode language.