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Editorial Team
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Asked: 2026-06-10T18:26:25+00:00

I would like to do if somebody adds a hex value at the end

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I would like to do if somebody adds a hex value at the end of the URL, I can show them a certain page.

For example, say I have colors.com, I would like it so if somebody want to go to colors.com/FF0000, it would display that hex on the page. Is it possible to grab it from the URL and display it although I would like it to be hex values only.

Remove certain letters and special characters so somebody can’t just use text.

Hope that makes sense.

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1 Answer

  1. Editorial Team

    You would need to use your web server’s URL rewriting to match patterns which look like hex colors (6 letters A-F and digits 0-9) and route accordingly.

    Apache mod_rewrite example to silently rewrite example.com/AA00FF to example.com/index.php?color=AA00FF:

    RewriteEngine On
# [A-Fa-f0-9]{6} matches six letters A-F and digits 0-9.
RewriteRule ^([A-Fa-f0-9]{6})$ index.php?color=$1 [L]

    In your PHP script index.php, retrieve it from $_GET['color']. You will need to validate it in PHP for that regex as well. Otherwise, you risk XSS attacks:

    // You MUST validate it in PHP as well, to avoid XSS attacks when you insert it into HTML
if (preg_match('/^[A-Z0-9]{6}$/i', $_GET['color'])) {
  // ok to use
}
else {
  // Invalid hex color value. Don't use it!
}

    I’m not saying this is a good idea, but to set the body color, you can then just do:

    // Last warning: DON'T DO THIS UNLESS YOU HAVE VALIDATED WITH THE REGEX ABOVE!
echo "<body style='background-color: #{$_GET['color']}'>";
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