Extract Twitter username from links to Twitter profiles

extract-twitter-username.php

<?php

$html = file_get_contents( 'http://example.com' );

preg_match_all( '/https?:\/\/(?:www.)?twitter.com\/#?([a-zA-Z0-9_]+)\/?(?![\/a-z]+)/i', $html, $maybe_twitters );

if ( ! empty( $maybe_twitters[1] ) ) {
	printf( 'Found %s', $maybe_twitters[1][0] );
} else {
	print( 'Nothing found!' );
}