If you want your code to play nice with others, you should definitely:

• When constructing URL strings:
  • Use only \w+ for parameter names
  • uri-escape (see URI::Escape) the parameter values
• When parsing URL strings:
  • Just use CGI.pm's param functionality. Or, for an extra buffer, use CGI::Safe.

The only "&" characters in your URL should be explicitly put there by you (or code that constructs the URL for you) as separators -- generally, all metacharacters, whitespace, etc. will be URI-escaped into %xy hex values.

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