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<?php $text = "11a. A numbered agenda item\nUnnumbered agenda item\n12. Another numbered agenda item\nAnother UNnumbered agenda item\n13. A numbered agenda item"; if (preg_match_all('/^(\d+[a-z]?\.)\s*(.*(?:\R(?!\d+[a-z]?\.).*)*)/m', $text, $matches)) { print_r(array_combine($matches[1], $matches[2])); }
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.26, 8.1.0 - 8.1.13
Array ( [11a.] => A numbered agenda item Unnumbered agenda item [12.] => Another numbered agenda item Another UNnumbered agenda item [13.] => A numbered agenda item )

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