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<?php
$regex = "~(?=(\b\w+\((?:\d+|(?1))\)))~";
$string = "cos(t(2))+t(51)";
$count = preg_match_all($regex,$string,$matches);
print_r($matches[1]);

Success #stdin #stdout 0.01s 20568KB

stdin

Standard input is empty

stdout

Array
(
    [0] => cos(t(2))
    [1] => t(2)
    [2] => t(51)
)

https://ideone.com/hsB9kg

http://stackoverflow.com/q/23859588/

language:

PHP (php 7.3.5)

created:

visibility:

secret

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