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Parsing a Querystring With Perl

Having trouble parsing a querystring with Perl? If so, then Jeff's step-by-step guide will save you headaches and have you up and running in no time!

TABLE OF CONTENTS:
  1. Parsing a Querystring With Perl
  2. A Simple ISINDEX Query
  3. A Simple POST Query
By: Jeff Pinyan
Rating: starstarstarstarstar / 7
December 18, 2002

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At first, parsing a CGI query sounds like a simple task. A query is just a list of key-value pairs, so a hash sounds like the right tool. But many CGI query parsers fail for anything other than what the specific query is they expect. What if it's a POST when you expected GET? What if the pairs are delimited by ; instead of &? What if the query is encoded via m/fd instead of a/xwfu? What if there's more than one value for a field? And what about file uploads, a topic I've not covered yet?

How quickly a simple function becomes complex. But if we break the cases down into simple procedures, we'll see it's not as bad as we thought.

 
 
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