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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-10281) Table function parse regular expression contains backslash failed
Date Wed, 05 Sep 2018 10:57:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-10281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16604274#comment-16604274
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ASF GitHub Bot commented on FLINK-10281:
----------------------------------------

yanghua commented on issue #6659: [FLINK-10281] Table function parse regular expression contains
backslash failed
URL: https://github.com/apache/flink/pull/6659#issuecomment-418688875
 
 
   cc @twalthr @fhueske 

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> Table function parse regular expression contains backslash failed
> -----------------------------------------------------------------
>
>                 Key: FLINK-10281
>                 URL: https://issues.apache.org/jira/browse/FLINK-10281
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API &amp; SQL
>            Reporter: vinoyang
>            Assignee: vinoyang
>            Priority: Major
>              Labels: pull-request-available
>
> for example,  regular expression matches text ("\w") or number ("\d") :
> {code:java}
> testAllApis(
>   "foothebar".regexExtract("foo([\\w]+)", 1),       //OK, the method got 'foo([\w]+)'
>   "'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, the method got 'foo([\w]+)'
but must pass four '\'
>   "thebar"
> )
> {code}
> the "similar to" function has the same issue.
>  



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