Bug 28241: Fix regex to allow for content before and after comma

Bug 28241: Fix regex to allow for content before and after comma

1. Set up the OPACNoResultsFound with the {QUERY_KW} placeholder.
2.Do a search with a comma that will return no results. Like "King, Martin Luther". If the returns results add some additional characters to the search until no results are returns.
3. Look at the #noresultsfound HTML element. Anything before (or after) the comma is omitted. So the placeholder looks something like 'Martin Luther' instead of 'King, Martin Luther'.
4. Apply patch
5. Try the search again, you should see the content before and after a comma

Signed-off-by: Lisette Scheer <lisettes@latahlibrary.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 685fcb1880b5be44283620a0f7eacc3f2064680d)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>