passwordPattern top-level constant

String const passwordPattern

or r'^(\s*|\d+)$'

Implementation

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