PATTERN_ALPHANUMERIC constant
String
const PATTERN_ALPHANUMERIC
Implementation
static const String PATTERN_ALPHANUMERIC = "^[a-zA-Z0-9öäüÖÄÜß]+\$";
static const String PATTERN_ALPHANUMERIC = "^[a-zA-Z0-9öäüÖÄÜß]+\$";