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https://issues.apache.org/jira/browse/METRON-2002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16777273#comment-16777273
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Nick Allen commented on METRON-2002:
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This *may* be related or have been fixed by METRON-1922 and
[https://github.com/apache/metron/pull/1291,] but I have not confirmed.
> Number of escape backslashes in REGEXP_MATCH Stellar function is inconsistent
> -----------------------------------------------------------------------------
>
> Key: METRON-2002
> URL: https://issues.apache.org/jira/browse/METRON-2002
> Project: Metron
> Issue Type: Bug
> Reporter: Stefan Kupstaitis-Dunkler
> Priority: Minor
>
> When I want to escape a character in REGEXP_MATCH I need to escape it with 2
> backslashes in the Stellar command line and 4 backslashes when you actually
> deploy it via the Metron config. Ideally it should be only one backslash in
> both cases, but a consistent behaviour as a starting point and a mention in
> the docs to escape the escape characters would be sufficient.
> Simple example:
> *
> {code:java}
> ip_address := '10.10.10.10'{code}
> * This matches on Stellar command line interface:
> {code:java}
> REGEXP_MATCH(ip_address, 10\\.10\\.10\\.10){code}
> * This works when configured for a running topology:
> {code:java}
> REGEXP_MATCH(ip_address, 10\\\\.10\\\\.10\\\\.10){code}
> * Any other amount of slashes in both cases produces an error or no match.
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