passwordPattern top-level constant
String
const passwordPattern
or r'^(\s*|\d+)$'
Implementation
const onlyNum=r'^[0-9]+$|^$';///or r'^(\s*|\d+)$'
const passwordPattern=r'^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[!@#\$&*~]).{8,}$';