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https://issues.apache.org/jira/browse/CALCITE-5910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17752542#comment-17752542
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Mihai Budiu commented on CALCITE-5910:
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[~julianhyde] this conversation quotes an example in
https://issues.apache.org/jira/browse/CALCITE-5873
> Add REGEXP_EXTRACT and REGEXP_SUBSTR functions (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]
> and
> [REGEXP_SUBSTR|https://cloud.google.com/bigquery/docs/reference/standard-sql/string_functions#regexp_substr]
> functions 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.
>
> *{{REGEXP_SUBSTR(value, regexp[, position[, occurrence]])}}*
> Synonym for REGEXP_EXTRACT
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