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https://issues.apache.org/jira/browse/SPARK-28076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Takeshi Yamamuro resolved SPARK-28076.
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Resolution: Won't Fix
> String Functions: SUBSTRING support regular expression
> ------------------------------------------------------
>
> Key: SPARK-28076
> URL: https://issues.apache.org/jira/browse/SPARK-28076
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Yuming Wang
> Priority: Major
>
> ||Function||Return Type||Description||Example||Result||
> |{{substring(_string_}} from _{{pattern}}_)|{{text}}|Extract substring
> matching POSIX regular expression. See [Section
> 9.7|https://www.postgresql.org/docs/11/functions-matching.html] for more
> information on pattern matching.|{{substring('Thomas' from '...$')}}|{{mas}}|
> |{{substring(_string_}} from _{{pattern}}_ for _{{escape}}_)|{{text}}|Extract
> substring matching SQL regular expression. See [Section
> 9.7|https://www.postgresql.org/docs/11/functions-matching.html] for more
> information on pattern matching.|{{substring('Thomas' from '%#"o_a#"_' for
> '#')}}|{{oma}}|
> For example:
> {code:sql}
> -- T581 regular expression substring (with SQL's bizarre regexp syntax)
> SELECT SUBSTRING('abcdefg' FROM 'a#"(b_d)#"%' FOR '#') AS "bcd";
> {code}
> https://www.postgresql.org/docs/11/functions-string.html
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