javascript - How to find documents with title like "*.pdf" in alfresco lucene search -

i need restrict search documents title suffix ".pdf" in javascript

right add lucene search this:

ls += ' +@cm\\:title:"*\\.pdf" ' 

it job, returns titles like:

cloud strategy - presentation (pdf) 

what correct solution?

have tried simple:

ls += ' +@cm\\:title:".pdf" '; 

it worked me on test example.