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!contains_cs operator

Filters a record set for data that does not include a case-sensitive string. contains searches for characters rather than terms of three or more characters. The query scans the values in the column, which is slower than looking up a term in a term index.

The following table provides a comparison of the contains operators:

Operator	Description	Case-Sensitive	Example (yields `true`)
`contains`	RHS occurs as a subsequence of LHS	No	`"CiscoASA" contains "AsA"`
`!contains`	RHS doesn't occur in LHS	No	`"CiscoASA" !contains "abc"`
`contains_cs`	RHS occurs as a subsequence of LHS	Yes	`"CiscoASA" contains_cs "ASA"`
`!contains_cs`	RHS doesn't occur in LHS	Yes	`"CiscoASA" !contains_cs "Asa"`

The following abbreviations are used in the table above:

RHS = right hand side of the expression
LHS = left hand side of the expression

For further information about other operators and to determine which operator is most appropriate for your query, see datatype string operators.

Performance tips

Performance depends on the type of search and the structure of the data.

For faster results, use the case-sensitive version of an operator, for example, contains_cs, not contains.

If you're testing for the presence of a symbol or alphanumeric word that is bound by non-alphanumeric characters at the start or end of a field, for faster results use has or in. Also, has works faster than contains, startswith, or endswith, however it is not as precise and could provide unwanted records.

Syntax

Case-sensitive syntax

T | where Column !contains_cs (Expression)

Arguments

T - The tabular input whose records are to be filtered.
Column - The column to filter.
Expression - Scalar or literal expression.

Returns

Rows in T for which the predicate is true.

Example

events
    | project original_time, data_source_name
    | where original_time > ago(5m) 
        and data_source_name !contains_cs "ASA"
    | summarize EventCount=count() by DataSourceName=data_source_name
    | project DataSourceName, EventCount
    | sort by EventCount
    | take 10

Results

DataSourceName	EventCount
CheckPointSource1	102394
CheckPointSource2	101391
paloAltoPASeriesSource2	82714
paloAltoPASeriesSource7	81714
microsoftWindowsSource2	75766