Partial Match Not Working in Google Sheets - google-apps-script

Question

I have this sheet tab that contains these columns:
In another tab, I have this column:
I want the result to be like this:
I have this formula that I'm using that somewhat works:
=IFERROR(TEXTJOIN(" ",TRUE,QUERY(ARRAYFORMULA(IF(REGEXMATCH($B2,Masterlist!$A$2:$A$139),Masterlist!$A$2:$A$139,"")),"where Col1 is not null")))
but the result I'm getting is like this:

Answer 1

function lfunko() {
const ss = SpreadsheetApp.getActive();
const sh1 = ss.getSheetByName("Sheet1");
const [h1, ...vs1] = sh1.getDataRange().getDisplayValues();
let obj1 = {};
h1.forEach((h, i) => { obj1[h] = i + 1; });
const code = sh1.getRange(2,obj1["Activity Code"],sh1.getLastRow() - 1).getDisplayValues().flat().map(c => c.replace(/ /g,''));
const sh2 = ss.getSheetByName("Sheet2");
const [h2, ...vs2] = sh2.getDataRange().getDisplayValues();
let obj2 = {};
h2.forEach((h, i) => { obj2[h] = i + 1; });
const acct = sh2.getRange(2,obj2["Account"],sh2.getLastRow() - 1).getDisplayValues().flat();
let arr = [["Activity Code","Account"]]
acct.forEach((a,i) =>
code.forEach(c => {
if(~c.indexOf(a)) {
arr.push([c,a]);
}
}
));
Logger.log(JSON.stringify(arr));
const sh3 = ss.getSheetByName("Sheet3");
sh3.clearContents();
sh3.getRange(1,1,arr.length, arr[0].length).setValues(arr);
}
Sheet1:
A
1
Activity Code
2
_account1_immediate
3
_lunch_account2
4
_break_account3_lunch
5
_break account 3
Sheet2:
A
1
Account
2
account1
3
account2
4
account3
5
account11
Sheet3:
A
B
1
Activity Code
Account
2
_account1_immediate
account1
3
_lunch_account2
account2
4
_break_account3_lunch
account3
5
_breakaccount3
account3