The basic structure of a StringScriptingRule is very similar to the structure of a HttpParsingRule. It also consists of two sections named Search and ScriptGen (see example below).
<StringScriptingRule>
<Name>Replace TimeStamp</Name>
<Active>true</Active>
<Search>
<SearchIn>FormFieldValue</SearchIn>
<LB>
<Offset>0</Offset>
</LB>
<RB>
<Length>0</Length>
</RB>
</Search>
<ScriptGen>
<Action>CheckTimeStamp</Action>
</ScriptGen>
</StringScriptingRule>