regex - regular expression to remove ID=1234 from a string (PHP)

Solution:

You could use...

$str = preg_replace('/[?&;]ID=\d+/', '', $str);
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I'm assuming this is meant to be a normal URL, hence the[?&;]. If that's the case, the& should be a?.

If it's part of a larger list of GET params, you are probably better off using...

parse_str($str, $params);

unset($params['ID']);

$str = http_build_query($params);
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Solution:

I'm guessing that& is not allowed as a character in theID attribute. In that case, you can use

$result = preg_replace('/&ID=[^&]+/', '', $subject);
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or (possibly better, thanks to PaulP.R.O.):

$result = preg_replace('/[?&]ID=[^&]+/', '', $subject);
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This will remove&ID= (the second version would also remove?ID=) plus any amount of characters that follow until the next& or end of string. This approach makes sure that any following attributes will be left alone:

$str = 'http://www.site.com?spam=eggs&ID=1620&foo=bar';
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will be changed into

$str = 'http://www.site.com?spam=eggs&foo=bar';
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Solution:

You can just use
(that is if the URL is of the form:http://something.com?id1=1&id2=2):

$url = parse_url($str);

echo "http://{$url['host]}";
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