Author: hieuvu
MDL-78312 core_user: add an 'exact match only' option
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a3da58a9cb83bb986943878f656191c858f33f4d
http://github.com/moodle/moodle/commit/a3da58a9cb83bb986943878f656191c858f33f4d
+ 4.3 en [userselectorsearchmatching,core]
+ 4.3 en [userselectorsearchfromstart,core]
+ 4.3 en [userselectorsearchanywhere,core]
+ 4.3 en [userselectorsearchexactmatchonly,core]