matches regex operator

Applies to: ✅ Microsoft Fabric ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel

Filters a record set based on a case-sensitive regular expression value.

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

Note

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

Syntax

T | where col matches regex (expression)

Name	Type	Required	Description
T	`string`	✔️	The tabular input whose records are to be filtered.
col	`string`	✔️	The column by which to filter.
expression	scalar	✔️	The regular expression regex.md used to filter. The maximum number of regex groups is 16. For more information about the regex syntax supported by Kusto, see regular expression.

Rows in T for which the predicate is true.

StormEvents
| summarize event_count=count() by State
| where State matches regex "K.*S"
| where event_count > 10
| project State, event_count

Output