How to use expression matching shell? $regularexpression= "\.html$" The formula used to filter out all the file name. Html end of the document Document $filename1 $filename2 variables will exist. . . . . . . . . . . . . . . . . . . . . . . . . . . $filenamen China How to match up all the file name. Html end of the file name? Can be in perl Use if /$filename1=~\.html$/     .............. Else     .............. I do not know how to use the shell Please advise experts Thank you How to use expression matching shell? Can die --> [ Closed window ]