{"action":"opened","issue":{"url":"https://api.github.com/repos/OpenRefine/OpenRefine/issues/1550","repository_url":"https://api.github.com/repos/OpenRefine/OpenRefine","labels_url":"https://api.github.com/repos/OpenRefine/OpenRefine/issues/1550/labels{/name}","comments_url":"https://api.github.com/repos/OpenRefine/OpenRefine/issues/1550/comments","events_url":"https://api.github.com/repos/OpenRefine/OpenRefine/issues/1550/events","html_url":"https://github.com/OpenRefine/OpenRefine/issues/1550","id":308175368,"number":1550,"title":"Partition operation does not consider Zero-Length assertion situation","user":{"login":"quan17","id":10971020,"avatar_url":"https://avatars1.githubusercontent.com/u/10971020?v=4","gravatar_id":"","url":"https://api.github.com/users/quan17","html_url":"https://github.com/quan17","followers_url":"https://api.github.com/users/quan17/followers","following_url":"https://api.github.com/users/quan17/following{/other_user}","gists_url":"https://api.github.com/users/quan17/gists{/gist_id}","starred_url":"https://api.github.com/users/quan17/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/quan17/subscriptions","organizations_url":"https://api.github.com/users/quan17/orgs","repos_url":"https://api.github.com/users/quan17/repos","events_url":"https://api.github.com/users/quan17/events{/privacy}","received_events_url":"https://api.github.com/users/quan17/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-03-23T20:52:46Z","updated_at":"2018-03-23T20:52:46Z","closed_at":null,"author_association":"NONE","body":"Version 2.8\r\nMacOS, Safari\r\n\r\nCreate one column with data: abc, abb, abce, abe, abed\r\nTransform on one column with GREL,  `partition(value,/(?<=e)/)`, \r\n\r\n**Current Results:**\r\n\r\n<img width=\"446\" alt=\"screen shot 2018-03-23 at 4 45 00 pm\" src=\"https://user-images.githubusercontent.com/10971020/37852598-9ea49b0e-2eb9-11e8-9c0c-8845039cdca1.png\">\r\n\r\n\r\n **Expected Results:**\r\n\r\nThe first row( the regex not match any context) should return null instead of \"\" (empty String),\r\notherwise, it can not tell the difference with the row 3,4,5, which have regex match.\r\n\r\nThis issue also make the smartSplit operation has wrong result:\r\n<img width=\"577\" alt=\"screen shot 2018-03-23 at 4 48 48 pm\" src=\"https://user-images.githubusercontent.com/10971020/37852731-169a5432-2eba-11e8-82f4-c297f4d4d5d8.png\">\r\n\r\nplease look the row 5, expected results should be [ abe, d ]\r\n\r\nThank you.\r\n\r\n\r\n\r\n"}}
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