What is source filters in Perl?

Source filters in Perl are a powerful feature that allows you to modify the Perl source code before it is compiled. This process enables you to change the way Perl interprets your code, providing a way to implement domain-specific languages or to create syntactic sugar for your applications. Source filters can be particularly useful for code generation or transformation tasks.

Example of Source Filters

    # Example of a simple source filter in Perl
    use Filter::Simple;

    FILTER {
        s/foo/bar/g;  # Replaces all occurrences of 'foo' with 'bar'
    }

    print "This foo will become bar\n";  # This will print: This bar will become bar