Online PHP editor | output for 8ECVS

<?php define('WAR_CODES', [ ' ' => '', // World War 1 'A' => 'Allied Forces', 'AFG' => 'Australian - War on Terrorism', 'AGX' => 'Act of Grace', 'ALX' => 'Algeria - World War 2', 'ARG' => 'Argentina - Gulf War', 'ARX' => 'Argentina - World War 2', 'BAG' => 'Bahrain - Gulf War', 'BAL' => 'Peacekeeping - Balkans', 'BCG' => 'Bangladesh - Gulf War', 'BG' => 'Belgium - World War 1', 'BGG' => 'Belgium - Gulf War', 'BGK' => 'Belgium - Korean War', 'BGX' => 'Belgium - World War 2', 'BRX' => 'Brazil - World War 2', 'BUG' => 'Bulgaria - Gulf War', 'BUR' => 'Burma', 'BUX' => 'Bulgaria - World War 2', 'CAM' => 'Australian - Cambodian Service', 'CCG' => 'Canadian - Gulf War', 'CHX' => 'China - World War 2', 'CIX' => 'Chile - World War 2', 'CLK' => 'Colombia - Korean War', 'CN' => 'Canadian - World War 1', 'CNK' => 'Canadian - Korean War', 'CNS' => 'Canadian - Other Service', 'CNX' => 'Canadian - World War 2', 'CON' => 'Peacekeeping - Congo', 'CYP' => 'Peacekeeping - Cyprus', 'CZG' => 'Czechoslovakia - Gulf War', 'CZX' => 'Czechoslovakia - World War 2', 'DEG' => 'Denmark - Gulf War', 'DNK' => 'Denmark - Korean War', 'DNX' => 'Denmark - World War 2', 'EGG' => 'Egypt - Gulf War', 'EGX' => 'Egypt - World War 2', 'EGY' => 'Peacekeeping - Egypt', 'ESX' => 'Estonia - World War 2', 'ET' => 'Australian - East Timor Service', 'ETK' => 'Ethiopia - Korean War', 'ETX' => 'Ethiopia - World War 2', 'FIJ' => 'Fiji', 'FIX' => 'Finland - World War 2', 'FR' => 'France - World War 1', 'FRG' => 'France - Gulf War', 'FRK' => 'France - Korean War', 'FRX' => 'France - World War 2', 'FW' => 'Australian - World War 1', 'GHA' => 'Ghana', 'GR' => 'Greece - World War 1', 'GRE' => 'Peacekeeping - Greece', 'GRG' => 'Greece - Gulf War', 'GRK' => 'Greece - Korean War', 'GRX' => 'Greece - World War 2', 'GW' => 'Australian - Gulf War Service', 'HKS' => 'Hong Kong', 'HKX' => 'Hong Kong - World War 2', 'HLG' => 'Netherlands - Gulf War', 'HLK' => 'Netherlands - Korea', 'HLX' => 'Netherlands - World War 2', 'HUX' => 'Hungary - World War 2', 'IDA' => 'Peacekeeping - Indonesia', 'IND' => 'India', 'IQ' => 'Australian - War in Iraq', 'ISR' => 'Peacekeeping - Israel', 'IT' => 'Italy - World War 1', 'ITG' => 'Italy - Gulf War', 'ITK' => 'Italy - Korean War', 'ITX' => 'Italy - World War 2', 'IV' => 'Indigenous Veterans of PNG', 'JA' => 'Japan - World War 1', 'KM' => 'Australian - Korean/Malayan Service', 'KO' => 'South Korea - Korean War', 'KOS' => 'South Korea - Vietnam War', 'KSH' => 'Peacekeeping - Kashmir', 'KUG' => 'Kuwait - Gulf War', 'KYA' => 'Kenya', 'LAX' => 'Latvia - World War 2', 'LBX' => 'Liberia - World War 2', 'LXK' => 'Luxembourg - Korean War', 'MAL' => 'Malaysian Pensioners', 'MAR' => 'Allied Mariner- World War 2', 'MAU' => 'Mauritius', 'MLS' => 'Malaysia/Singapore', 'MO' => 'Montenegro - World War 1', 'MOG' => 'Morocco - Gulf War', 'MTX' => 'Malta - World War 2', 'MWI' => 'Malawi', 'N' => 'New Zealand - World War 1', 'NBA' => 'Australian - Namibian Service', 'NCG' => 'New Zealand - Gulf War', 'NF' => 'Newfoundland', 'NG' => 'New Guinea Civilians', 'NGR' => 'Nigeria', 'NIG' => 'Niger - Gulf War', 'NK' => 'New Zealand - Korean War', 'NRD' => 'Northern Zimbabwe (Rhodesia)', 'NSM' => 'New Zealand - Serving Member', 'NSS' => 'New Zealand Special O\'seas Service', 'NSW' => 'New Zealand Merchant Mariner - WW2', 'NWG' => 'Norway - Gulf War', 'NWK' => 'Norway - Korean War', 'NWX' => 'Norway - World War 2', 'NX' => 'New Zealand - World War 2', 'OMG' => 'Oman - Gulf War', 'P' => 'British - World War 1', 'PAD' => 'British Admiralty', 'PAG' => 'Pakistan - Gulf War', 'PAL' => 'Peacekeeping - Palestine', 'PAM' => 'British Air Ministry', 'PAX' => 'Panama - World War 2', 'PCA' => 'British Crown Agents', 'PCG' => 'British - Gulf War', 'PCR' => 'British Ministry O\'seas Development', 'PCV' => 'British Civilians', 'PHK' => 'Philippines - Korean War', 'PHS' => 'Philippines - Vietnam War', 'PHX' => 'Philippines - World War 2', 'PK' => 'British - Korean/Malayan Service', 'PLG' => 'Poland - Gulf War', 'PLX' => 'Poland - World War 2', 'PMS' => 'British Merchant Mariner - WW1', 'PO' => 'Portugal - World War 1', 'PSM' => 'British Serving Member', 'PSW' => 'British Merchant Mariner - WW2', 'PWO' => 'British War Office', 'PX' => 'British - World War 2', 'QAG' => 'Qatar - Gulf War', 'RD' => 'Zimbabwe (Rhodesia) - World War 1', 'RDX' => 'Zimbabwe (Rhodesia) - World War 2', 'RM' => 'Romania - World War 1', 'RU' => 'Russia - World War 1', 'RUG' => 'Russia - Gulf War', 'RUX' => 'Russia - World War 2', 'SA' => 'South Africa - World War 1', 'SAG' => 'Saudi Arabia - Gulf War', 'SAX' => 'South Africa - World War 2', 'SCG' => 'Sierra Leone - Gulf War', 'SE' => 'Serbia - World War 1', 'SEG' => 'Senegal - Gulf War', 'SIN' => 'Peacekeeping - Sinai', 'SL' => 'Sierra Leone', 'SM' => 'Australian - Serving Member', 'SO' => 'Australian - Somalian Service', 'SPG' => 'Spain - Gulf War', 'SR' => 'Australian - Malayan Emergency', 'SS' => 'Australian Special Overseas Service', 'SUD' => 'Sudan', 'SWK' => 'Sweden - Korean War', 'SWP' => 'Australian Merchant Mariner - WW2', 'SYG' => 'Syria - Gulf War', 'SYR' => 'Peacekeeping - Syria', 'SYX' => 'Syria - World War 2', 'THK' => 'Thailand - Korean War', 'THS' => 'Thailand - Vietnam War', 'TRG' => 'Turkey - Gulf War', 'TRK' => 'Turkey - Korean War', 'TZA' => 'Tanzania (Tanzanyika/Zanzibar)', 'UAG' => 'United Arab Emirates - Gulf War', 'UB' => 'Australian - Ubon 1965-68', 'URX' => 'Uruguay - World War 2', 'US' => 'United States - World War 1', 'USG' => 'United States - Gulf War', 'USK' => 'United States - Korean War', 'USS' => 'United States - Vietnam War', 'USX' => 'United States - World War 2', 'V' => 'Australian - Serving Member', 'VEX' => 'Venezuela - World War 2', 'VNS' => 'South Vietnam - Vietnam War', 'X' => 'Australian - World War 2', 'YEM' => 'Peacekeeping - Yemen', 'YGX' => 'Yugoslavia - World War 2', 'YU' => 'Australian - Yugoslavian Service', 'ZIM' => 'Peacekeeping - Zimbabwe', ]); $groups = [1 => '']; foreach (WAR_CODES as $code => $description) { switch (strlen($code)) { case 1: $groups[1] .= $code; break; case 2: $groups[2][$code[0]][] = $code[1]; break; case 3: $groups[3][$code[0]][$code[1]][] = $code[2]; break; } } $groups[1] = "[{$groups[1]}]\d{6}"; foreach ($groups[2] as $first => &$seconds) { $seconds = count($seconds) === 1 ? "$first{$seconds[0]}" : sprintf('%s[%s]', $first, implode($seconds)); } $groups[2] = '(?:' . implode('|', $groups[2]) . ')\d{5}'; foreach ($groups[3] as $first => &$seconds) { foreach ($seconds as $second => &$thirds) { $thirds = count($thirds) === 1 ? "$second{$thirds[0]}" : sprintf('%s[%s]', $second, implode($thirds)); } $seconds = count($seconds) === 1 ? "$first$thirds" : sprintf('%s(?:%s)', $first, implode('|', $seconds)); } $groups[3] = '(?:' . implode('|', $groups[3]) . ')\d{4}'; ksort($groups); echo implode("\n|", $groups);