仅从字符串中剥离完全匹配的子字符串

const targetString = "This is a sample string";
const subString = "sample";

if (targetString.includes(subString)) {
  console.log("子字符串存在于目标字符串中");
} else {
  console.log("子字符串不存在于目标字符串中");
}

const targetString = "This is a sample string";
const subString = "sample";

if (targetString.includes(subString)) {
  const extractedString = targetString.substring(targetString.indexOf(subString), targetString.indexOf(subString) + subString.length);
  console.log("提取的子字符串为：" + extractedString);
} else {
  console.log("子字符串不存在于目标字符串中");
}

const targetString = "This is a sample string";
const subString = "sample";

const regex = new RegExp(subString, "g");
const extractedString = targetString.match(regex);

if (extractedString) {
  console.log("提取的子字符串为：" + extractedString[0]);
} else {
  console.log("子字符串不存在于目标字符串中");
}