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https://issues.apache.org/jira/browse/CALCITE-6923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17939547#comment-17939547
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Ulrich Kramer commented on CALCITE-6923:
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The function has the same behavior for Postgres and BigQuery but a different
one for the the builtin function (which is using the java {{Matcher}}).
> REGEXP_REPLACE backward references not working
> ----------------------------------------------
>
> Key: CALCITE-6923
> URL: https://issues.apache.org/jira/browse/CALCITE-6923
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.38.0
> Reporter: Ulrich Kramer
> Priority: Minor
>
> REGEXP_REPLACE builtin function differs from Postgres/BigQuery
> The builtin function is using {{$1}} for backward reference. Postgres and
> [BigQuery|https://cloud.google.com/bigquery/docs/reference/standard-sql/string_functions#regexp_replace]
> are using {{\1}}.
> {code:SQL}
> SELECT REGEXP_REPLACE('abc','([bc]+)','$1','g')
> {code}
> produces {{abc}}. Running the same query against Postgres or BigQuery will
> return {{a$1}}.
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