如何重新解析包含变量名的变量字符串？

function parseVariableString(variableString, variables) {
  // 使用正则表达式提取变量名
  const variableRegex = /\${(.*?)}/g;
  const matches = variableString.match(variableRegex);

  // 遍历匹配到的变量名
  for (const match of matches) {
    // 提取变量名
    const variableName = match.substring(2, match.length - 1);

    // 获取对应的变量值
    const variableValue = variables[variableName];

    // 替换变量占位符为变量值
    variableString = variableString.replace(match, variableValue);
  }

  return variableString;
}

// 示例用法
const originalString = "Hello, ${name}! Today is ${day}.";
const variables = {
  name: "John",
  day: "Monday"
};

const parsedString = parseVariableString(originalString, variables);
console.log(parsedString); // 输出：Hello, John! Today is Monday.