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@ 2018-11-11T01:35:14Z

<?php

$truth = "((A^¬B)->C)";
while (strpos($truth, '(') !== false) {
    preg_match("~^[^(]*\((.*?)\)[^)]*$~", $truth, $str);
    $truth = $str[1];
    echo "$truth\n";
}

Output
Performance
VLD
References
Branches

strpos: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

27.77 ms | 405 KiB | 5 Q