However there are a number of significant differences in the operation of the search engines employed in the left and right panes. A consequence of this is that a search expression which succeeds in the left pane can fail in the right. Below are listed some of these differences.

• The left engine is always case-insensitive, while the right engine lets you choose.
• The left engine always assumes you are trying to match whole words, while the right engine lets you choose. However, the left engine employs a fuzzy logic by way of compensation, so that grammatical variants like serve, serves, server and served will all be found by typing in serving; also information will be found by typing info.
• The left engine lets you use wildcards * and ? with their usual meaning ("string" and "single character"), while the right engine doesn't. Note that the use of ? inhibits the search for grammatical variants mentioned above so, e.g., a search for dll will find dlls, but one for dl? will not.
• The left engine supports Boolean expressions like
  (Release)and((3)or(5)))
  (TUint8)not(TUint16)
  while the right engine doesn't.
• The default behaviour with the left engine for typing a two-word expression like active object is to assume an or relationship between two search strings, while the right engine treats this input as a single string. However, you can force the left engine to look for a single string by using quotes: "active object"
• Because of these special uses of double quotes and parentheses in the right engine, it is not possible to search for these characters in a string. In particular a search string containing parentheses not enclosed in quotes will cause an error. So it does not appear to be possible to do a search for Draw() while ignoring draw.