Regular expression for matching \n and space

I am trying to use regular expression within my perl script to parse a file to match:

Space and "\n" (newline) in a alternating manner - i.e first i would like it to match space then a "\n", then a space (which is on a new line in the file... and so on)

thanks, -AD


Try this:

(^ \n)+

You can do:

if($file =~/ |(?: \n)+ ?/) {
        print $file." has the pattern\n";

The regex used is |(?: \n)+ ? which matches:

  • Single space or
  • One or more space\n followed by an optional space

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