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https://issues.apache.org/jira/browse/FLINK-9990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16569035#comment-16569035
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ASF GitHub Bot commented on FLINK-9990:
---------------------------------------
yanghua commented on a change in pull request #6448: [FLINK-9990] [table] Add
regex_extract supported in TableAPI and SQL
URL: https://github.com/apache/flink/pull/6448#discussion_r207699091
##########
File path:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
##########
@@ -450,6 +450,40 @@ class ScalarFunctionsTest extends ScalarTypesTestBase {
"1111111111111111111111111111111111111111111111111111111111111111")
}
+ @Test
+ def testRegexExtract(): Unit = {
Review comment:
Good point, here is a problem, I wrote this case to test :
```scala
testAllApis(
"foothebar".regexExtract("foo([\\w]+)", 1), //OK,
"'foothebar'.regexExtract('foo([\\\\w]+)', 1)", //failed, the
method got 'foo([\\w]+)' returns "", but if pass 'foo([\\w]+)' would get
compile error.
"REGEX_EXTRACT('foothebar', 'foo([\\\\w]+)', 1)", //OK, but must pass
four '\'
"thebar"
)
```
It seems flink pre-process the regex which contains `\xxx`. A few days ago,
we also met this issue when test `similar to` to match the regex which contains
`\d`.
cc @twalthr
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> Add regex_extract supported in TableAPI and SQL
> -----------------------------------------------
>
> Key: FLINK-9990
> URL: https://issues.apache.org/jira/browse/FLINK-9990
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Minor
> Labels: pull-request-available
>
> regex_extract is a very useful function, it returns a string based on a regex
> pattern and a index.
> For example :
> {code:java}
> regexp_extract('foothebar', 'foo(.*?)(bar)', 2) // returns 'bar.'
> {code}
> It is provided as a UDF in Hive, more details please see[1].
> [1]: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF
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