Boolean Expression
Boolean expression search type defines whether Boolean expressions are matched on a line by line basis or matched across the whole file.
For example "File AND Pro" on a line by line basis would find only lines with both File and Pro on them and therefore only files where File and Pro both occurred on at least one line. However if matching across the whole file the same expression would find files where both File and Pro occurred anywhere in the file either on the same line or on different lines.
The 'Allow wildcards' option specifies whether or not the Boolean expression phrases will treat the characters * or ? as wildcard characters. For more information see Boolean Expressions.
Regular Expression Syntax
Regular expression syntax defines whether regular expression matching during searches should use the Perl compatible regular expression engine or the Classic regular expression engine. See Expression Types for more information.
File Hashing
File Hashing specifies which hashing algorithms FileLocator Pro should use when searching for a given file hash.