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https://issues.apache.org/jira/browse/CALCITE-5979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17763232#comment-17763232
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Julian Hyde commented on CALCITE-5979:
--------------------------------------
The simplest thing is to change the specification to match what is easy to
implement. Specifically, to say that {{REGEXP_REPLACE}} supports Java regexp
syntax.
We can have a follow-up case to allow the {{REGEXP_xxx}} functions support BQ
syntax, and to devise a flag to enable the BQ mode. In that case, list the
cases where the current implementation is wrong. Over time, the demand to fix
that follow-up case will grow, but we can defer it for a while.
> Add REGEXP_REPLACE function (enabled in BigQuery library)
> ---------------------------------------------------------
>
> Key: CALCITE-5979
> URL: https://issues.apache.org/jira/browse/CALCITE-5979
> Project: Calcite
> Issue Type: Task
> Reporter: Jerin John
> Assignee: Jerin John
> Priority: Major
> Labels: pull-request-available
>
> Add support for [REGEXP_REPLACE
> |https://cloud.google.com/bigquery/docs/reference/standard-sql/string_functions#regexp_replace]
> function from BigQuery.
> *{{REGEXP_REPLACE(value, regexp, replacement)}}*
> Returns a STRING where all substrings of {{value}} that match regular
> expression {{regexp}} are replaced with {{{}replacement{}}}.
> backslashed-escaped digits (\1 to \9) can be used within the {{replacement}}
> argument to insert text matching the corresponding parenthesized group in the
> {{regexp}} pattern.
> Example (added one space between \ \ to override md formatting):
> {{SELECT REGEXP_REPLACE("abc'", "b(.)", "X\ \1") as result;}}
> |result|
> |aXc|
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