google-apps-script DriveApp Service - Files by type and search string Get files by file type with matching string in file name

Example

Get all Google Forms with the word "Untitled" in the file name.

function mainSearchFunction(searchStr) {
  var fileInfo,arrayFileIDs,arrayFileNames,arrayOfIndexNumbers,
      allFileIDsWithStringInName,i,searchStr,thisID;//Declare variables
  
  if (!searchStr) {
    searchStr = "Untitled";//Assign a string value to the variable
  };

  fileInfo = getFilesOfType();//Run a function that returns files information
  arrayFileNames = fileInfo[1];//Get the array of file names
  arrayOfIndexNumbers = searchFileNamesForString(arrayFileNames,searchStr);

  //Logger.log('searchStr: ' + searchStr)
  //Logger.log(arrayOfIndexNumbers)
  
  allFileIDsWithStringInName = [];
  arrayFileIDs = fileInfo[0];

  for (i=0;i<arrayOfIndexNumbers.length;i+=1) {
    thisID = arrayFileIDs[arrayOfIndexNumbers[i]];
    allFileIDsWithStringInName.push(thisID);
  };
  
  Logger.log(allFileIDsWithStringInName)
};

function getFilesOfType() {
  var allFormFiles,arrFileName,arrFileID,arrFileUrls,thisFile;
  
  allFormFiles = DriveApp.getFilesByType(MimeType.GOOGLE_FORMS);
  arrFileName = [];
  arrFileID = [];
  arrFileUrls = [];
  
  while (allFormFiles.hasNext()) {
    thisFile=allFormFiles.next();
    arrFileName.push(thisFile.getName());
    arrFileID.push(thisFile.getId());
    arrFileUrls.push(thisFile.getUrl());
  };

  //Logger.log(arrFileName)
  return [arrFileID,arrFileName];
};


function searchFileNamesForString(arrayFileNames,searchStr) {
  var arrayIndexNumbers,i,L,thisName;
  
  arrayIndexNumbers = [];

  L = arrayFileNames.length;

  for (i=0;i<L;i+=1){
    thisName = arrayFileNames[i];
    Logger.log(thisName);
    Logger.log('thisName.indexOf(searchStr): ' + thisName.indexOf(searchStr));
    
    if (thisName.indexOf(searchStr) !== -1) {
      arrayIndexNumbers.push(i);
    };
  };

  return arrayIndexNumbers;
};