在Dart中查找和替换字符串 [英] Find and Replace Strings in Dart

问题描述

我正在为该应用程序使用Flutter，但在应用程序逻辑方面遇到了麻烦。

I'm using flutter for this app and I'm having trouble with the app's logic. Any help is much appreciated.

应用目标：
-用户通过文本框
输入文本来解码（替换）单词的缩写-App查找任何缩写（几个），并且仅用文本替换该缩写。

App goal: Decode(replace) all input abbreviation to words by: -User inputs text via text box -App looks for any abbreviations(several) and replaces the abbreviation only with text.

我能够做到这一点，但我的情况下所有缩写均应为在输入文本中将不起作用，或者第二个索引将不起作用。
我尝试了几种无效的方法，我在abv和相应的文本中使用了2个列表。

I was able to do it will a few abbreviation but with my case all abbreviation should be in the input text or it wouldn't work or the second index wont work. I tried several ways which didn't work, I'm using 2 list for the abv and corresponding text.

下面是代码。

List<String> coded = ["GM", "HOT", "YAH"]; //ABV list
List<String> decoded = ["Gmail", "Hotmail", "Yahoo"]; //corresponding list 
Map<String, String> map = new Map.fromIterables(coded, decoded);

String txt = "HOT was the best until GM took over"; //input text

void main() {
  if ((txt.contains(coded[0]))) { //GM
    String result = txt.replaceAll(coded[0], decoded[0]); //Replace with Gmail

    print(result);
  }
  else if ((txt.contains(coded[0])) && (txt.contains(coded[1]))) {
    String result = (txt.replaceAll(coded[0], decoded[0]));
    (txt.replaceAll(coded[1], decoded[1]));

    print(result);
  }
  else if ((txt.contains(coded[0])) && (txt.contains(coded[1])) && (txt.contains(coded[2]))) {
    String result = txt.replaceAll(coded[0], decoded[0]);
    txt.replaceAll(coded[1], decoded[1]);
    txt.replaceAll(coded[2], decoded[2]);

    print(result);
  }
  else {
    print(txt);
  }
} 

推荐答案

其他根据问题标题来到这里的用户，请使用 replaceAll ：

For others coming here based on the question title, use replaceAll:

final original = 'Hello World';
final find = 'World';
final replaceWith = 'Home';
final newString = original.replaceAll(find, replaceWith);
// Hello Home

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