!hasprefix_cs operator

Applies to: ✅ Microsoft FabricAzure Data ExplorerAzure MonitorMicrosoft Sentinel

Filters a record set for data that doesn't have a case-sensitive starting string. !hasprefix_cs searches for indexed terms, where an indexed term is three or more characters. If your term is fewer than three characters, the query scans the values in the column, which is slower than looking up the term in the term index.

Operator Description Case-Sensitive Example (yields true)
hasprefix RHS is a term prefix in LHS No "North America" hasprefix "ame"
!hasprefix RHS isn't a term prefix in LHS No "North America" !hasprefix "mer"
hasprefix_cs RHS is a term prefix in LHS Yes "North America" hasprefix_cs "Ame"
!hasprefix_cs RHS isn't a term prefix in LHS Yes "North America" !hasprefix_cs "CA"

Note

The following abbreviations are used in the above table:

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

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

Performance tips

Note

Performance depends on the type of search and the structure of the data. For best practices, see Query best practices.

Syntax

T | where column !hasprefix_cs (expression)

Learn more about syntax conventions.

Parameters

Name Type Required Description
T string ✔️ The tabular input whose records are to be filtered.
column string ✔️ The column by which to filter.
expression scalar ✔️ The scalar or literal expression for which to search.

Returns

Rows in T for which the predicate is true.

Example

StormEvents
| summarize event_count=count() by State
| where State !hasprefix_cs "P"
| count

Output

Count
64