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[SPARKR][DOC] regexp_extract should doc that it returns empty string when match fails
## What changes were proposed in this pull request? Doc change - see https://issues.apache.org/jira/browse/SPARK-16324 ## How was this patch tested? manual check Author: Felix Cheung <felixcheung_m@hotmail.com> Closes #14934 from felixcheung/regexpextractdoc.
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