Today i will give you an idea here’s what you would need if you want to
skip blank lines or lines that have a ‘#’ at the start (or after
one or more white-space characters, i.e. spaces, tabs etc.):
while ( < $f> ) {
next if /^\s*($|#)/;
do_something_with_the_line( $_ );
}
The stuff in between the slashes is the regular expression,
applied to try to match the default argument ‘$_’, which in
this case is the line you just read in from the file.
The ‘^’ at the start says that the comparison is to start at
the very beginning of the line. The ‘\s*’ matches an unspe-
cified number of white-space charecters (between 0 and as
many as there are). The ‘$|#’ means: either the end of the
line (‘$’) or a ‘#’ character, with the ‘|’ being the or
operator. Thus the whole line can be read as: next if the
line just read starts with zero or more white-space charac-
ters, followed by the end of the line or a ‘#’ character.
The paranthesis around the ‘$|#’ are necessary because
/^\s*$|#/
would mean: match if the line either just comtains zero or more
white space characters (i.e. it’s a blank line) or if there’s a
‘#’ to be found anywhere within the line.
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