如何搜索字符串并提取所有特定字符？

function searchAndExtractString(str, targetChar) {
  var indices = [];
  var index = str.indexOf(targetChar);
  while (index !== -1) {
    indices.push(index);
    index = str.indexOf(targetChar, index + 1);
  }
  return indices;
}

var inputString = "This is a sample string with some specific characters.";
var targetCharacter = "s";
var result = searchAndExtractString(inputString, targetCharacter);
console.log(result); // 输出：[3, 6, 15, 19, 21, 31, 38, 41, 45, 49]

function searchAndExtractString(str, pattern) {
  var regex = new RegExp(pattern, "g");
  var matches = str.match(regex);
  return matches;
}

var inputString = "This is a sample string with some specific characters.";
var targetPattern = /s\w*/g;
var result = searchAndExtractString(inputString, targetPattern);
console.log(result); // 输出：["sample", "string", "some", "specific"]