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https://issues.apache.org/jira/browse/CALCITE-5910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17752184#comment-17752184
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Jerin John commented on CALCITE-5910:
-------------------------------------
Thanks for the pointer [~mbudiu], I tried implementing one of the other regex
functions with the java native library and we observed some variances in the
pattern processing between the two libraries (ref comment in CALCITE-5873).
Could you please review that comment and provide your suggestions if it would
be advisable to use the re2 java library instead.
> Add REGEXP_EXTRACT function (enabled in BigQuery library)
> ---------------------------------------------------------
>
> Key: CALCITE-5910
> URL: https://issues.apache.org/jira/browse/CALCITE-5910
> Project: Calcite
> Issue Type: Task
> Reporter: Jerin John
> Assignee: Jerin John
> Priority: Major
> Labels: pull-request-available
>
> Add support for
> [REGEXP_EXTRACT|https://cloud.google.com/bigquery/docs/reference/standard-sql/string_functions#regexp_extract]
> function from BigQuery.
> *{{REGEXP_EXTRACT(value, regexp[, position[, occurrence]])}}*
> Returns the substring in {{value}} that matches the regular expression
> {{{}regexp{}}}. Returns {{NULL}} if there is no match.
> * If the regular expression contains a capturing group ({{{}(...){}}}), and
> there is a match for that capturing group, that match is returned. If there
> are multiple matches for a capturing group, the last match is returned.
> * If {{position}} is specified, the search starts at this position in
> {{{}value{}}}, otherwise it starts at the beginning of {{{}value{}}}.
> * If {{occurrence}} is specified, the search returns a specific occurrence
> of the {{regexp}} in {{{}value{}}}, otherwise returns the first match.
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