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https://issues.apache.org/jira/browse/FLINK-10281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16611965#comment-16611965
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ASF GitHub Bot commented on FLINK-10281:
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twalthr commented on issue #6671: [FLINK-10281] [table] Fix string literal
parsing in Table & SQL API and SQL Client
URL: https://github.com/apache/flink/pull/6671#issuecomment-420616795
Thank you @dawidwys. I will improve the commits and merge this.
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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 & 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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