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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 @ +filelist element | + - Begin quote metacharacters (e.g., the +period) + - Join each element with alternation ("or") charac +ter

As shown, this results in the following:

1234567_3a_20101000\.html?|99877_b_20111111\.html?|99877_c_20111111\.h +tml? ...

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:

->name(qr/^(?:$regex)$/) ^^^^^^^^^^^^

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.


In reply to Re^3: Search array of file names in directory structure by Kenosis
in thread Search array of file names in directory structure by Anonymous Monk

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