Replace all characters not in range (Java String)

Question

How do you replace all of the characters in a string that do not fit a criteria. I\'m having trouble specifically with the NOT operator.

Specifically, I\'m trying

Answer 1

To explain: The ^ at the start of a character class will negate that class But it has to be inside the class for that to work. The same character outside a character class is the anchor for start of string/line instead.

You can try this instead:

"[^0-9]"