php - preg_match_all with surrounding data -

i have large amount of log data need relevant information out of. syntax is:

word1 text keyword text word2 word1 text keyword text word2 word1 text keyword text word2 word1 text keyword text word2

would possible use regex block out of - when queried keyword return word1 text this_keyword text word2

ps: there multiple instances of 1 keyword, should return of blocks (preg_match_all, preg_set_order?).

as per comment there starting , finishing word each block.

you can following:

split input string blocks (array). end of block identified whitespace followed word2 , preceded word1.
search array got above keyword.

$arr = preg_split('/(?<=word2)\s+(?=word1)/',$log); $keyword = 'keyword1'; $result = preg_grep("/\b$keyword\b/",$arr);

TY