Universal Regular Expression for URL Matching with or without Protocols

Regular Expression to Match URLs with or without Protocols

For URLs that may or may not include the "http://www" prefix, a regular expression can be used to perform the matching operation. A detailed RegEx pattern is provided below:

((https?|ftp)://)?([a-z0-9+!*(),;?&amp=$_.-]+(:[a-z0-9+!*(),;?&amp=$_.-]+)?@)?([a-z0-9\-\.]*)\.(([a-z]{2,4})|([0-9]{1,3}\.([0-9]{1,3})\.([0-9]{1,3})))(:[0-9]{2,5})?(/([a-z0-9+$_%-]\.?)+)*/?(\?[a-z+&$_.-][a-z0-9;:@&%=+/$_.-]*)?(\#[a-z_.-][a-z0-9+$%_.-]*)?

To utilize this pattern for URL validation, it can be applied in the following manner:

<code class="php">if (preg_match("~^$regex$~i", 'www.example.com/etcetc', $m))
    var_dump($m);

if (preg_match("~^$regex$~i", 'http://www.example.com/etcetc', $m))
    var_dump($m);</code>

This RegEx solution offers a comprehensive way to match URLs regardless of whether they contain the "http://" prefix or not.

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