Flutter语言 - Dart -从字符串输入中删除隐藏字符

Question

我试图比较2个字符串，但是我的比较总是失败。作为参考，一个字符串是我从手机存储中获得的文件名，它看起来像以撇号结束，尽管它在任何地方都不可见。

请考虑以下省道代码:

import 'dart:convert';
void main() {
const Utf8Codec utf8 = Utf8Codec();

String input = 'chatnum.txt';
String stringwithapostrophe = 'chatnum.txt'';

String compInput = utf8.encode(input).toString();
String compComp = utf8.encode(stringwithapostrophe).toString();

print (compInput);
print (compComp);

if (compInput == compComp) {
print ('Yes it matches');

} else {
print ('No it does not');
}


}

这个输出结果是:

[99, 104, 97, 116, 110, 117, 109, 46, 116, 120, 116]
[99, 104, 97, 116, 110, 117, 109, 46, 116, 120, 116, 39]
No it does not

那么如何从字符串中删除最后一个撇号呢?我试过.removeAt和.removeLast。但是我就是打不开。

Answer 1

我对它应用了正则表达式。

String filenametosend = (basename(f.toString()))
.replaceAll(RegExp(r"[-!$%^&*()+|~=`{}#@[]:;'’<>?,/"
'"”'
"]"), '');

Answer 2

也是这样:

final apostrophe = ''';
final length = stringwithapostrophe.length;
if (length > 0 && stringwithapostrophe[length - 1] == apostrophe) {
stringwithapostrophe = stringwithapostrophe.substring(0, length - 1);
}

或者这样(remove all):

final apostrophe = ''';
stringwithapostrophe = stringwithapostrophe.replaceAll(apostrophe, '');

Remove (any) last:

final length = stringwithapostrophe.length;
stringwithapostrophe = length > 0
? stringwithapostrophe.substring(0, length - 1)
: stringwithapostrophe;