Here is the log,
headline="[{'contentUUID':'10a1f2a2-1489-11e7-b0c1-37e417ee6c76','title':'South Africa\xE2\x80\x99s Zuma embarks on a game of chicken with markets'},{'contentUUID':'6961129e-14fa-11e7-80f4-13e067d5072c','title':'Race for speed among algo traders hits peak'}]"
I am able to get the first contentUUID and title by adding the search - rex field=_raw "'contentUUID':'(?P[^']+)" | rex field=_raw "'title':'(?P
can you add this before your rex command?:
|makemv delim="},{" data