validateAddress function
Implementation
bool validateAddress(String? addr) {
if (addr == null) return false;
// String dollar = '\$';
// String escape = '\\';
// String escapeS = '\\s';
// String escapeN = '\\n';
// String escapeSingleQuote = "$escape'";
// String singleQuote = "'";
// String pattern =
// '^([a-zA-Z0-9$escape#$escape&$escape‘$escapeSingleQuote$escape`$escape.$escape-$escape=$escape+$escape,$escape($escape)$escapeS$escapeN])*[^/!$dollar%^*_~|$escape$escape;:"<>?]$dollar';
// String r = 'r';
final regExp = RegExp(r'[/!\$%^*_~|\\;:"<>?\[\]\{\}]');
return regExp.hasMatch(addr);
}