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ios 数字 字母 特殊符号(6-20)位

-(BOOL)judgePassWordLegal:(NSString *)text{     BOOL result = false;     if ([text length] >= 6){       //  NSString * regex = @"^(?=.*[a-zA-Z])(?=.*\\d)(?=.*[~!@#$%¥^&*()_+`\\-={}:\";'<>,.|€£/]).{6,20}";         NSString * regex = @"^.{6,20}";         NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];         result = [pred evaluateWithObject:text];     }     return result;    }