[jira] [Created] (SPARK-8255) string function: regexp_extract

["Reynold Xin (JIRA)" <ji...@apache.org>]

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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