Flutter 使用省道/颤振对列表中的一根弦进行部分比较

对于颤振的世界来说是相当陌生的，我一直在寻找一种内置方法，它可以部分匹配一个字符串值和一个列表中的整个字符串集。例如

假设我在查询字符串“农舍边，凉拌卷心菜”

determineFood（字符串类别）{
列表类别数组=[]；
var breakFastWords=[“华夫饼”、“吐司”、“煎饼”、“煎蛋饼”、“煎蛋饼”]；
var午餐词=[“沙拉”、“三明治”、“汤”、“汉堡”、“意大利面”、“陀螺”、“豪吉”]；
var dinnerWords=[“汉堡”、“牛排”、“猪肉”、“排骨”]；
var侧词=[“调味品”、“饮料”、“芥末”、“果冻”、“花生”、“凉拌卷心菜”]；
测试（字符串值）=>value.contains（类别）；
如果（早餐词。任何（测试））
{
添加（“早餐”）；
}

即使使用带有test（String value）的函数，而不是直接将字符串与带有“contains”的列表进行比较，我也无法获得匹配，除非两个字符串完全匹配（即仅“coleslaw”和“coleslaw”）

---

有人能提出更好的方法吗？

有几种方法可以做到这一点。一种方法与您所做的非常接近；但是您需要在匹配字符串之前调用

.toLowerCase（）

。另一种方法是使用regex，您可以告诉它忽略大小写

下面是一个例子：

final breakfastWords = ["waffle", "toast", "pancake", "omelette", "Omelet"];
final lunchWords = ["salad", "sandwich", "soup", "burger", "pasta", "gyro", "hoagie"];
final dinnerWords = ["burger", "steak", "pork", "ribs"];
final sideWords = ["dressing", "drink", "mustard", "jelly", "peanuts", "coleslaw"];
final sideReg =  RegExp("(?:dressing|drink|mustard|jelly|peanuts|coleslaw)", caseSensitive: false);

bool isBreakfast(String string) {
  String toTest = string.toLowerCase();
  return breakfastWords.any((word) => toTest.contains(word));
}

bool isLunch(String string) {
  String toTest = string.toLowerCase();
  return lunchWords.any((word) => toTest.contains(word));
}

bool isDinner(String string) {
  String toTest = string.toLowerCase();
  return dinnerWords.any((word) => toTest.contains(word));
}

bool isSide(String string) {
  String toTest = string.toLowerCase();
  return sideWords.any((word) => toTest.contains(word));
}

bool isSideRegex(String string) {
  return sideReg.hasMatch(string);
}

void main() {
  String testString = "Farmhouse Sides, Coleslaw";
  
  if(isBreakfast(testString)) {
    print("It's breakfast");
  }
  
  if(isLunch(testString)) {
    print("It's lunch");
  }
  
  if(isDinner(testString)) {
    print("It's dinner");
  }
  
  if(isSide(testString)) {
    print("It's a side");
  }
  
  if(isSideRegex(testString)) {
    print("It's a side found with regex");
  }
}final breakfastWords = ["waffle", "toast", "pancake", "omelette", "Omelet"];
final lunchWords = ["salad", "sandwich", "soup", "burger", "pasta", "gyro", "hoagie"];
final dinnerWords = ["burger", "steak", "pork", "ribs"];
final sideWords = ["dressing", "drink", "mustard", "jelly", "peanuts", "coleslaw"];
final sideReg =  RegExp("(?:dressing|drink|mustard|jelly|peanuts|coleslaw)", caseSensitive: false);

bool isBreakfast(String string) {
  String toTest = string.toLowerCase();
  return breakfastWords.any((word) => toTest.contains(word));
}

bool isLunch(String string) {
  String toTest = string.toLowerCase();
  return lunchWords.any((word) => toTest.contains(word));
}

bool isDinner(String string) {
  String toTest = string.toLowerCase();
  return dinnerWords.any((word) => toTest.contains(word));
}

bool isSide(String string) {
  String toTest = string.toLowerCase();
  return sideWords.any((word) => toTest.contains(word));
}

bool isSideRegex(String string) {
  return sideReg.hasMatch(string);
}

void main() {
  String testString = "Farmhouse Sides, Coleslaw";
  
  if(isBreakfast(testString)) {
    print("It's breakfast");
  }
  
  if(isLunch(testString)) {
    print("It's lunch");
  }
  
  if(isDinner(testString)) {
    print("It's dinner");
  }
  
  if(isSide(testString)) {
    print("It's a side");
  }
  
  if(isSideRegex(testString)) {
    print("It's a side found with regex");
  }
}

还请注意，您可以直接从字符串形成正则表达式：

---

final sideReg=RegExp（（？：${sideWords.join（|）），区分大小写：false）；

您可以先将这两个字符串转换为所有小写，然后再匹配它们。

final breakfastWords = ["waffle", "toast", "pancake", "omelette", "Omelet"];
final lunchWords = ["salad", "sandwich", "soup", "burger", "pasta", "gyro", "hoagie"];
final dinnerWords = ["burger", "steak", "pork", "ribs"];
final sideWords = ["dressing", "drink", "mustard", "jelly", "peanuts", "coleslaw"];
final sideReg =  RegExp("(?:dressing|drink|mustard|jelly|peanuts|coleslaw)", caseSensitive: false);

bool isBreakfast(String string) {
  String toTest = string.toLowerCase();
  return breakfastWords.any((word) => toTest.contains(word));
}

bool isLunch(String string) {
  String toTest = string.toLowerCase();
  return lunchWords.any((word) => toTest.contains(word));
}

bool isDinner(String string) {
  String toTest = string.toLowerCase();
  return dinnerWords.any((word) => toTest.contains(word));
}

bool isSide(String string) {
  String toTest = string.toLowerCase();
  return sideWords.any((word) => toTest.contains(word));
}

bool isSideRegex(String string) {
  return sideReg.hasMatch(string);
}

void main() {
  String testString = "Farmhouse Sides, Coleslaw";
  
  if(isBreakfast(testString)) {
    print("It's breakfast");
  }
  
  if(isLunch(testString)) {
    print("It's lunch");
  }
  
  if(isDinner(testString)) {
    print("It's dinner");
  }
  
  if(isSide(testString)) {
    print("It's a side");
  }
  
  if(isSideRegex(testString)) {
    print("It's a side found with regex");
  }
}final breakfastWords = ["waffle", "toast", "pancake", "omelette", "Omelet"];
final lunchWords = ["salad", "sandwich", "soup", "burger", "pasta", "gyro", "hoagie"];
final dinnerWords = ["burger", "steak", "pork", "ribs"];
final sideWords = ["dressing", "drink", "mustard", "jelly", "peanuts", "coleslaw"];
final sideReg =  RegExp("(?:dressing|drink|mustard|jelly|peanuts|coleslaw)", caseSensitive: false);

bool isBreakfast(String string) {
  String toTest = string.toLowerCase();
  return breakfastWords.any((word) => toTest.contains(word));
}

bool isLunch(String string) {
  String toTest = string.toLowerCase();
  return lunchWords.any((word) => toTest.contains(word));
}

bool isDinner(String string) {
  String toTest = string.toLowerCase();
  return dinnerWords.any((word) => toTest.contains(word));
}

bool isSide(String string) {
  String toTest = string.toLowerCase();
  return sideWords.any((word) => toTest.contains(word));
}

bool isSideRegex(String string) {
  return sideReg.hasMatch(string);
}

void main() {
  String testString = "Farmhouse Sides, Coleslaw";
  
  if(isBreakfast(testString)) {
    print("It's breakfast");
  }
  
  if(isLunch(testString)) {
    print("It's lunch");
  }
  
  if(isDinner(testString)) {
    print("It's dinner");
  }
  
  if(isSide(testString)) {
    print("It's a side");
  }
  
  if(isSideRegex(testString)) {
    print("It's a side found with regex");
  }
}