Recently, I was thinking about that example in the docs where they demonstrate a method for inserting commas into a numerical string. Now, I realize that they're trying to illustrate a specific mechanism with regexes... but that thing is just clumsy and awful and obfuscated for any Perl beginner. So, just for my own entertainment, I decided to see how I'd do it "for real" - i.e., in the best way possible rather than by this contrived method.
Herewith, humbly, I present a couple of options. :)
#!/usr/bin/perl -w
use strict;
die "Usage: ", $0 =~ /([^\/]+)$/, " <numeric_string>\n"
unless @ARGV && $ARGV[0] =~ /^\d+$/;
my ($c, @list);
for (reverse split //, $ARGV[0]){
unshift @list, $c++ % 3 || $c == 1 ? $_ : "$_,";
}
print @list;
# Or, instead of "cheating" with an unquoted list, we could
# aggregate to a string. It's not quite as neat, though. :(
#
# my ($c, $out);
# for (reverse split //, $ARGV[0]){
# $out = $c++ % 3 || $c == 1 ? "$_$out" : "$_,$out";
# }
# print "$out\n";
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
