# Perl Compatible Regular Expressions

The Filename and Comment sections on the search window use Perl Compatible Regular Expressions . In general use there are a number of differences to the wildcard expansion used on the command line:

- Use "." and not "?" for a single character.
- Use "abc.*ghk" and not "abc*ghk" for multiple characters
- Use "\." to represent the dot in a file extension
- Use "(?i)" to make the following characters case-insensitive