trouble with searching word (Exact match) in adobe using search API

Hi All,

I am using adobe search APIs to search for a team in the PDF programmatically.

I am passing search_string = "all", but it is searching 'allow' also. I want to search only keyword 'all'.

I tried with regexp, but it is throwing error: "Invalid_Input: Only string input is allowed".

I am using below code for search functionality.

document.addEventListener("adobe_dc_view_sdk.ready", function()

{

var adobeDCView = new AdobeDC.View({clientId: "<YOUR_CLIENT_ID>", divId: "adobe-dc-view"});

var previewFilePromise = adobeDCView.previewFile({

content: {location: {url: "https://documentcloud.adobe.com/view-sdk-demo/PDFs/Bodea Brochure.pdf"}},

metaData: {fileName: "Bodea Brochure.pdf"}

}, { enableSearchAPIs: true });

previewFilePromise.then(adobeViewer => {
adobeViewer.getAPIs().then(apis => {
apis.search(<SEARCH_STRING>)
.then(searchObject => console.log(searchObject))
.catch(error => console.log(error));
});
});

});

Kindly Help me to solve this issue. I am stuck here.