DOCS-1204 - Note about the = operator (#5930)

* Update

* Update docs/cse/rules/cse-rules-syntax.md

Co-authored-by: Kim (Sumo Logic) <[email protected]>

---------

Co-authored-by: Kim (Sumo Logic) <[email protected]>

Author: jpipkin1

docs/cse/rules/cse-rules-syntax.md

@@ -195,6 +195,10 @@ The equal to (=) function returns “true” if the expressions are equal, or 
 
    `null = null`
 
+:::note
+The `=` and `==` functions do not match against a regular expression or pattern. Instead, use the [`like`](#like) function.
+:::
+
 ### ==
 
 The double equal sign (==) function returns “true” if the two expressions are equal. The two expressions must be the same type, and must be a type that can be used in an equality comparison. For complex types such as array and struct, the data types of fields must be orderable.