!hasprefix_cs operator
Filters a record set for data that does not have a case-sensitive starting string. has searches for indexed terms, where a 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 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
Note
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, hasprefix_cs, not hasprefix. For best practices, see Query best practices.
Syntax
T | where Column !hasprefix_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
StormEvents
| summarize event_count=count() by State
| where State !hasprefix_cs "P"
| count
Output
| Count |
|---|
| 64 |