Redirect to particular page with preg_match

I have a search box. When user enters a single character like ‘A’ or ‘B’ or ‘C’. Instead of running a query on my database, I redirect them to appropriate page of a to z directory

So for example if a user search’s for ‘H’ they get taking to www.domain.com/a_to_z/h/

To achieve this I have

if($_GET[search] == "a") echo header("location:/a_to_z/a/");
if($_GET[search] == "b") echo header("location:/a_to_z/b/");
if($_GET[search] == "c") echo header("location:/a_to_z/c/");

This works but as you can see it’s not very efficient.

I know it’s possible开发者_开发问答 to accomplish this with a single line using prge_match but I don’t know how to actually do it.

Your help will be much appreciated

Thanks

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The regex [a-z] will only match a single character from lowercase a to lowercase z. To include uppercase and numbers, use [a-zA-Z0-9] instead. It's probably what you're looking for:

if (preg_match('~^[a-z]$~', $_GET['search'])) {
    // redirect
} else {
    // handle errors
}

This is a good site for the various regular expression basics.

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 header("location:/a_to_z/".$_GET[search]."/");

take on mind that $_GET[search] isn't validated in any way here