(Bug 45546) [TUX] Filtering by a word does not work for non-Latin scripts

Regex using \\b will not work with non latin scripts. The closest
working pattern is (^||\\s) assuming word boundaries are spaces

Change-Id: I4980989b46ff94092d653a77262db77dfd87e2a5
Merge "(Bug 45546) [TUX] Filtering by a word does not work for non-Latin scripts"