minor clarification about regular expressions

Author: Sam Kleinman

source/reference/operator/regex.txt

@@ -7,8 +7,12 @@ $regex
 .. operator:: $regex
 
    The :operator:`$regex` operator provides regular expression
-   capabilities in queries. MongoDB uses Perl compatible regular
-   expressions (i.e. "PCRE."))The following examples are equivalent:
+   capabilities for pattern matching *strings* in queries. MongoDB uses Perl compatible regular
+   expressions (i.e. "PCRE.")
+
+   You can specify regular expressions using regular expression
+   objects or using the :operator:`$regex` operator. The following
+   examples are equivalent:
 
    .. code-block:: javascript
 
@@ -53,13 +57,13 @@ $regex
      - ``s`` allows the dot (e.g. ``.``) character to match all
        characters *including* newline characters.
 
-     :operator:`$regex` only provides the ``i`` and ``m`` options in the
-     short JavaScript syntax (i.e. ``/acme.*corp/i``). To use ``x``
+     :operator:`$regex` only provides the ``i`` and ``m`` options for
+     the native JavaScript regular expression objects (e.g. ``/acme.*corp/i``). To use ``x``
      and ``s`` you must use the ":operator:`$regex`" operator with the
      ":operator:`$options`" syntax.
 
    To combine a regular expression match with other operators, you
-   need to specify the ":operator:`$regex`" operator. For example:
+   need to use the ":operator:`$regex`" operator. For example:
 
    .. code-block:: javascript