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<?php
 
$re = '/(?:^\')?(.\')\1*(?:.$)?/'; 
$str = "'a'a'a'a'b'c'c'a'a'd'e'e'e'e"; 
preg_match_all($re, $str, $matches);
print_r($matches[0]);

Success #stdin #stdout 0.02s 52472KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => 'a'a'a'a'
    [1] => b'
    [2] => c'c'
    [3] => a'a'
    [4] => d'
    [5] => e'e'e'e
)

https://ideone.com/4S8BnL

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PHP (php 7.3.5)

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