elasticsearch/docs/reference/query-languages/esql/_snippets/operators/detailedDescription/rlike.md

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Matching special characters (eg. ., *, (...) will require escaping. The escape character is backslash \. Since also backslash is a special character in string literals, it will require further escaping.

ROW message = "foo ( bar"
| WHERE message RLIKE "foo \\( bar"

To reduce the overhead of escaping, we suggest using triple quotes strings """

ROW message = "foo ( bar"
| WHERE message RLIKE """foo \( bar"""