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HTTP/2 302 server: nginx date: Fri, 18 Jul 2025 00:45:30 GMT content-type: text/plain; charset=utf-8 content-length: 0 x-archive-redirect-reason: found capture at 20091027123057 location: https://web.archive.org/web/20091027123057/https://answers.oreilly.com/tag/perl server-timing: captures_list;dur=1.399327, exclusion.robots;dur=0.021130, exclusion.robots.policy;dur=0.008853, esindex;dur=0.015456, cdx.remote;dur=9.381937, LoadShardBlock;dur=140.797945, PetaboxLoader3.datanode;dur=51.031500, PetaboxLoader3.resolve;dur=78.071356 x-app-server: wwwb-app224 x-ts: 302 x-tr: 183 server-timing: TR;dur=0,Tw;dur=0,Tc;dur=0 set-cookie: SERVER=wwwb-app224; path=/ x-location: All x-rl: 0 x-na: 0 x-page-cache: MISS server-timing: MISS x-nid: DigitalOcean referrer-policy: no-referrer-when-downgrade permissions-policy: interest-cohort=() HTTP/2 200 server: nginx date: Fri, 18 Jul 2025 00:45:31 GMT content-type: text/html;charset=UTF-8 x-archive-orig-date: Tue, 27 Oct 2009 12:30:58 GMT x-archive-orig-server: Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 PHP/5.2.8 x-archive-orig-x-powered-by: PHP/5.2.8 x-archive-orig-set-cookie: answers_session_id=deleted; expires=Mon, 27-Oct-2008 12:30:57 GMT; path=/; domain=.oreilly.com; httponly x-archive-orig-set-cookie: answers_session_id=deleted; expires=Mon, 27-Oct-2008 12:30:57 GMT; path=/; domain=.oreilly.com; httponly x-archive-orig-cache-control: ,no-cachemust-revalidate, max-age=0 x-archive-orig-expires: 0 x-archive-orig-pragma: no-cache x-archive-orig-connection: close x-archive-guessed-content-type: text/html x-archive-guessed-charset: utf-8 memento-datetime: Tue, 27 Oct 2009 12:30:57 GMT link: ; rel="original", ; rel="timemap"; type="application/link-format", ; rel="timegate", ; rel="first memento"; datetime="Tue, 27 Oct 2009 12:30:57 GMT", ; rel="memento"; datetime="Tue, 27 Oct 2009 12:30:57 GMT", ; rel="next memento"; datetime="Sun, 08 Nov 2009 06:42:28 GMT", ; rel="last memento"; datetime="Wed, 23 Jul 2014 10:07:32 GMT" content-security-policy: default-src 'self' 'unsafe-eval' 'unsafe-inline' data: blob: archive.org web.archive.org web-static.archive.org wayback-api.archive.org athena.archive.org analytics.archive.org pragma.archivelab.org wwwb-events.archive.org x-archive-src: 52_12_20091027083930_crawl103-c/52_12_20091027122043_crawl100.arc.gz server-timing: captures_list;dur=0.623027, exclusion.robots;dur=0.026066, exclusion.robots.policy;dur=0.011824, esindex;dur=0.013229, cdx.remote;dur=16.708815, LoadShardBlock;dur=151.599381, PetaboxLoader3.resolve;dur=154.515442, PetaboxLoader3.datanode;dur=120.158276, load_resource;dur=163.573559 x-app-server: wwwb-app224 x-ts: 200 x-tr: 417 server-timing: TR;dur=0,Tw;dur=0,Tc;dur=0 x-location: All x-rl: 0 x-na: 0 x-page-cache: MISS server-timing: MISS x-nid: DigitalOcean referrer-policy: no-referrer-when-downgrade permissions-policy: interest-cohort=() content-encoding: gzip perl Questions and Answers - O'Reilly Answers

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Topics: perl

4
VOTES

0
ALTERNATES
Convert Binary, Octal, and Hexidecimal Numbers in Perl
By gnat
Perl understands numbers specified in binary (base-2), octal (base-8), and hexadecimal (base-16) notation only when they occur as literals in your programs. If they come in as data—such as by readin...
20 October 2009 - 05:10 PM | 0 Comments
Tags:
binary
octal
hexidecimal
convert
perl
2
VOTES

0
ALTERNATES
How to Multiply Matrices in Perl
By gnat
If you want to multiply a pair of two-dimensional arrays, use the PDL modules, available from CPAN. PDL is the Perl Data Language—modules that give fast access to compact matrix and mathematical fun...
20 October 2009 - 04:53 PM | 0 Comments
Tags:
perl
multiplication
matrices
2
VOTES

0
ALTERNATES
How to Generate Random Numbers in Perl
By gnat
If you want to make random numbers in a given range, inclusive, such as when you randomly pick an array index, simulate rolling a die in a game of chance, or generate a random password, use Perl's...
20 October 2009 - 04:01 PM | 0 Comments
Tags:
rand
random numbers
perl
numbers
3
VOTES

0
ALTERNATES
How to Round Floating-Point Numbers in Perl
By gnat
If you want to round a floating-point value to a certain number of decimal places, use the Perl function sprintf, or printf if you're just trying to produce output: # round off to ...
20 October 2009 - 03:40 PM | 0 Comments
Tags:
sprintf
numbers
floating point
perl
printf
4
VOTES

0
ALTERNATES
How to Work with Roman Numerals in Perl
By gnat
If you want to convert between regular numbers and Roman numerals, use the Roman module from CPAN: use Roman; $roman = roman($arabic); # convert to roman numerals &#...
20 October 2009 - 03:30 PM | 0 Comments
Tags:
CPAN
roman numerals
perl
3
VOTES

0
ALTERNATES
How to Properly Capitalize a Title or Headline in Perl
By gnat
If you have a string representing a headline, the title of book, or some other work that needs proper capitalization, use a variant of this tc( ) titlecasing function: INIT { our %nocap;...
20 October 2009 - 03:11 PM | 0 Comments
Tags:
strings
capitalization
perl
1
VOTES

0
ALTERNATES
How to Parse Comma-Separated Data in Perl
By gnat
If have a data file containing comma-separated values that you need to read, but these data fields may have quoted commas or escaped quotes in them, use the standard Tex...
20 October 2009 - 02:13 PM | 0 Comments
Tags:
perl
csv
CPAN
1
VOTES

0
ALTERNATES
Exchange Values Without Using Temporary Variables in Perl
By gnat
If you want to exchange the values of two scalar variables, but don't want to use a temporary variable, use list assignment to reorder the variables. ($VAR1, $VAR2) = ($VAR2, ...
20 October 2009 - 02:03 PM | 0 Comments
Tags:
variables
strings
perl
1
VOTES

0
ALTERNATES
How to Match IPv4 Addresses with Regular Expressions
By StevenLevithan
If you want to check whether a certain string represents a valid IPv4 address in 255.255.255.255 notation, try one of these examples from Regular Expressions Cookbook: Simple regex to check fo...
30 September 2009 - 01:11 PM | 0 Comments
Tags:
python
perl
javascript
java
address
IPv4
regex
ruby
.Net
1
VOTES

0
ALTERNATES
How to validate traditional date formats with regular expressions
By Jan Goyvaerts
If you want to validate dates in the traditional formats mm/dd/yy, mm/dd/yyyy, dd/mm/yy, and dd/mm/yyyy, using a simple regex that simply checks whether the input looks ...
18 September 2009 - 12:45 PM | 0 Comments
Tags:
ruby
python
perl
PCRE
javascript
java
.Net
dates
regex

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