Thank you so much. 
for (@files)
{
    if (/ ^ [\w_-]+ \. [\w:]+ \. [\w_-]+ \. ErrorLog $ /x)
    {
        s/ ^ ([\w_-]+) \. ([\w:]+) CSS \. /$1.$2./x;
        say;
    }
}

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Can i extend  s/ ^ ([\w_-]+) \. ([\w:]+) CSS \. /$1.$2./x; subsitution of CSS to [A-Z]. ?

In reply to Re^2: Perl file name parsing - Regular expression by rinkish85
in thread Perl file name parsing - Regular expression by rinkish85

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