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startswith_cs operator

Filters a record set for data with a case-sensitive string starting sequence.

The following table provides a comparison of the startswith operators:

Operator Description Case-Sensitive Example (yields true)
startswith RHS is an initial subsequence of LHS No "microsoftWindowsSource1" startswith "Mic"
!startswith RHS isn't an initial subsequence of LHS No "microsoftWindowsSource1" !startswith "Cis"
startswith_cs RHS is an initial subsequence of LHS Yes "microsoftWindowsSource1" startswith_cs "mis"
!startswith_cs RHS isn't an initial subsequence of LHS Yes "microsoftWindowsSource1" !startswith_cs "cis"

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, hassuffix_cs, not hassuffix.


T | where col startswith_cs (expression)


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

## Returns

Rows in T for which the predicate is true.


THe query will return all log sources that match the the specified string with case sensitivity.

 | project original_time, data_source_name
 | where data_source_name startswith_cs "mic"
 |take 3


original_time data_source_name
2023-04-06T21:31:24.620Z microsoftWindowsSource5
2023-04-06T21:31:24.620Z microsoftWindowsSource6
2023-04-06T21:31:24.620Z microsoftWindowsSource1