@wisiendot/expo-unlimited-secure-store/src/options.js

An 'unlimited' secure store engine for expo projects, also compatible with redux-persist. (Expo's SecureStore was limited to 2KB in SDK v33)

export const replacementCharacter = '_';

export const replacer = (string, char) => {
    return string.replace(/[^a-z0-9.\-_]/gi, char);
};