Reynold Xin created SPARK-8255:
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Summary: string function: regexp_extract
Key: SPARK-8255
URL: https://issues.apache.org/jira/browse/SPARK-8255
Project: Spark
Issue Type: Sub-task
Reporter: Reynold Xin
regexp_extract(string subject, string pattern, int index): string
Returns the string extracted using the pattern. For example,
regexp_extract('foothebar', 'foo(.*?)(bar)', 2) returns 'bar.' Note that some
care is necessary in using predefined character classes: using '\s' as the
second argument will match the letter s; '\\s' is necessary to match
whitespace, etc. The 'index' parameter is the Java regex Matcher group() method
index. See docs/api/java/util/regex/Matcher.html for more information on the
'index' or Java regex group() method.
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