Regex break string based on and/or in a search concept

Question

Hi I am trying to create regex expression and I am running into problems.

Basically this is what I have:

(.+?)(and|or)(.+?)

What I

Answer 1

Here's a recursive function which also uses a recursive regex, let's recurse!!!

$text = '(user email ends with "@email.com" and user name is "John") or ((user email ends with "@domain.com" and user name is "Bob") or (user id is 5))';

print_r(buildtree($text));

function buildtree($input){
    $regex = <<<'regex'
    ~(                      # Group 1
        \(                  # Opening bracket
            (               # Group 2
                (?:         # Non-capturing group
                    [^()]   # Match anything except opening or closing parentheses
                |           # Or
                    (?1)    # Repeat Group 1
                )*          # Repeat the non-capturing group zero or more times
            )               # End of group 2
        \)                  # Closing bracket
    )~x
regex;
// The x modifier is for this nice and fancy spacing/formatting
    $output = [];

    if(preg_match_all($regex, $input, $m)){ // If there is a match
        foreach($m[2] as $expression){  // We loop through it
            $output[] = buildtree($expression); // And build the tree, recursive !!!
        }
        return $output;
    }else{  // If there is no match, we just split
        return preg_split('~\s*(?:or|and)\s*~i', $input);
    }
}

Output:

Array
(
    [0] => Array
        (
            [0] => user email ends with "@email.com"
            [1] => user name is "John"
        )

    [1] => Array
        (
            [0] => Array
                (
                    [0] => user email ends with "@domain.com"
                    [1] => user name is "Bob"
                )

            [1] => Array
                (
                    [0] => user id is 5
                )

        )

)

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