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Regular expressions are a notation for describing sets of character strings. When a string is in the set described by a regular expression, we say that the regular expression matches the string.The simplest regular expression is a single literal character. Except for the metacharacters like *+?(...
In KQL, regular expressions must be encoded as string literals and follow the string quoting rules. For example, the RE2 regular expression \A is represented in KQL as "\\A". The extra backslash indicates that the other backslash is part of the regular expression \A....