matchesFormat static method
Implementation
static bool matchesFormat(String data) {
if (data.length < 13 || !data.startsWith('data:')) return false;
var idx = data.indexOf(',');
if (idx < 12) return false;
var base64 = data.substring(idx - 7, idx);
if (base64 != ';base64') return false;
return true;
}