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<?php $re = '/(?<!\S)(?:(?!keyword\b)\w+\h+){1,3}keyword\b(?=((?:\h+(?!keyword\b)\w+){1,3}))/u'; $strings = [ "word1 word2 word3 keyword word4 word5 word6 keyword word7 word8 word9 word10", "word2 keyword word4 word5 word6 keyword word7 word8", "word2 word3 keyword word4 word5 word6 keyword word7 keyword word10", ]; foreach ($strings as $str) { preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0); $matches = array_map(function($m) { return $m[0] . $m[1]; }, $matches); print_r($matches); }
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.4, 8.3.6 - 8.3.25, 8.4.1 - 8.4.12
Array ( [0] => word1 word2 word3 keyword word4 word5 word6 [1] => word4 word5 word6 keyword word7 word8 word9 ) Array ( [0] => word2 keyword word4 word5 word6 [1] => word4 word5 word6 keyword word7 word8 ) Array ( [0] => word2 word3 keyword word4 word5 word6 [1] => word4 word5 word6 keyword word7 [2] => word7 keyword word10 )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [0] => word1 word2 word3 keyword word4 word5 word6 [1] => word4 word5 word6 keyword word7 word8 word9 ) Array ( [0] => word2 keyword word4 word5 word6 [1] => word4 word5 word6 keyword word7 word8 ) Array ( [0] => word2 word3 keyword word4 word5 word6 [1] => word4 word5 word6 keyword word7 [2] => word7 keyword word10 )
preferences:
153.95 ms | 409 KiB | 5 Q