正则匹配文中是否有加密货币

getTextTokenName({required String text}) {
List cryptoNames = [];
String str = "$text";
RegExp r = RegExp(r"$[a-zA-Z]*");

Iterable matches = r.allMatches(text);
for (Match m in matches) {

cryptoNames.add(m.group(0)!.substring(1));
print(cryptoNames);

}
return cryptoNames;
}