$re = '/((\w*)\s*\(((?:(?>[^(){}]+)|(?1))*)\)|\{((?:(?>[^(){}]+)|(?1))*)\})/';
$str = 'function(x){
x_identity=sapply(x, function(i) i*2)
x_squared=sapply(x, function(i){
i^2
}
)
}
x_identity=sapply(x, function(i) i*2)
function(i)
x_squared=sapply(x, function(i){
i^2
}
)
function(i){
i^2
}
';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php