如何在Flutter中找出列表与字符串的公共子串？

示例1 #

tags = ['what','play','school']
string = "what is your name?"

Output = ['what']

示例2 #

tags = ['what is','play football','school','food']
string = "what is your school name? Do you play football there?"

Output = ['what is','school',"play football"]

实现方案 #

你可以通过Dart的字符串方法直接实现该功能，核心逻辑是遍历标签列表，筛选出属于目标字符串子串的标签。

基础匹配（大小写敏感）

编写工具函数，利用contains方法检查标签是否存在于目标字符串中：

List<String> findMatchingTags(List<String> tags, String targetString) {
  return tags.where((tag) => targetString.contains(tag)).toList();
}

测试验证

验证示例1：

void main() {
  List<String> tags = ['what','play','school'];
  String target = "what is your name?";
  print(findMatchingTags(tags, target)); // 输出: [what]
}

验证示例2：

void main() {
  List<String> tags = ['what is','play football','school','food'];
  String target = "what is your school name? Do you play football there?";
  print(findMatchingTags(tags, target)); // 输出: [what is, school, play football]
}

忽略大小写的匹配

如果需要不区分大小写的匹配，可统一转换为小写（或大写）后再检查：

List<String> findMatchingTagsIgnoreCase(List<String> tags, String targetString) {
  final lowerTarget = targetString.toLowerCase();
  return tags.where((tag) => lowerTarget.contains(tag.toLowerCase())).toList();
}

内容的提问来源于stack exchange，提问作者Mst. Murshida Khnom