The case-insensitive =~ (equals) string operator

Learn how to use the =~ (equals) operator to filter a record set for data with a case-insensitive string.

Filters a record set for data with a case-insensitive string.

The following table provides a comparison of the == (equals) operators:

Operator	Description	Case-Sensitive	Example (yields `true`)
`==`	Equals	Yes	`"aBc" == "aBc"`
`!=`	Not equals	Yes	`"abc" != "ABC"`
`=~`	Equals	No	`"abc" =~ "ABC"`
`!~`	Not equals	No	`"aBc" !~ "xyz"`

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

Performance tips

When possible, use == - a case-sensitive version of the operator.

T | where col =~ (expression)

Name	Type	Required	Description
T	`string`	✔️	The tabular input whose records are to be filtered.
col	`string`	✔️	The column to filter.
expression	`string`	✔️	The expression used to filter.

Returns the rows in T for which the predicate is true.

The following example shows how to use the =~ operator to filter a record set for data with a case-insensitive string.

StormEvents
| where State =~ "kansas"
| project EventId, State

The following table only shows the first 10 results. To see the full output, run the query.

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