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<?php
namespace App\Services;
class XrefService
{
/**
* Regex patterns to parse Xref tokens (e.g. alt.binaries.* optionally followed by :number).
*/
private const XREF_PATTERN_WITH_NUM = '/(^[a-zA-Z]{2,3}\\.(bin(aries|arios|aer))\\.[a-zA-Z0-9]?.+)(:\\d+)/';
private const XREF_PATTERN_NO_NUM = '/(^[a-zA-Z]{2,3}\\.(bin(aries|arios|aer))\\.[a-zA-Z0-9]?.+)/';
* Extracts valid Xref tokens from a space-separated Xref string.
public function extractTokens(?string $xref): array
if (empty($xref)) {
return [];
}
$tokens = [];
foreach (explode(' ', $xref) as $token) {
if (preg_match(self::XREF_PATTERN_WITH_NUM, $token, $m) || preg_match(self::XREF_PATTERN_NO_NUM, $token, $m)) {
$tokens[] = $m[0];
return $tokens;
* Returns tokens that appear in $headerXref but not in $existingXref.
public function diffNewTokens(?string $existingXref, ?string $headerXref): array
$existing = $this->extractTokens($existingXref);
$incoming = $this->extractTokens($headerXref);
return array_values(array_diff($incoming, $existing));
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newznab-tmux
