Here's the line, explained a bit:
my $regex = join '|', map "\Q$_\E?", @filelist;
^ ^ ^ ^^
| | | ||
| | | |+ - Last character in file name optio
+nal, i.e., the "l" in html
| | | + - End quote metacharacters
| | + - The default scalar aliased to each @
| + - Begin quote metacharacters (e.g., the
+ - Join each element with alternation ("or") charac
As shown, this results in the following:
This line builds a regex using the file names in @filelist. When passed to File::Find::Rule as the -name rule, only those files names which match the regex will be returned by File::Find::Rule, if any.
If you want File::Find::Rule to look for a particular pattern, change the regex here:
However, if you want to process the files returned by File::Find::Rule, you can do something like this:
my @matchingFileNames = grep /pattern/, @found_html;
where "pattern" represents the regex that would 'filter' the elements of @found_html.
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