Get all text outside parenthesis while capturing word index - php

Question

How can I get all text that's not in parenthesis using preg_match_all? The reason I need to use preg_match_all is because I want to get the index of each word.
Given sentence:
Hello how [t- are] you [t- today], Sir?
I can extract all the words inside the ( ), which works. How can I also get all text outside the ( ) separately?
preg_match_all('/\[t-(.*?)\]/', $this->target, $targetWords, PREG_OFFSET_CAPTURE);
Output:
Array
(
[0] => Array
(
[0] => are
[1] => 47
),
[0] => Array
(
[0] => today
[1] => some number
)
)
Note: I already know about preg_split:
$outsideParenthesis = preg_split('/\[.*?\]/', $this->target);
But this doesn't allow me to maintain the index.
Note 2: It may help to provide my end goal:
I want to take a string of custom markdown. For each word, I want to generate word objects that specify their type and content.
The reason is, I'd like to send an array of word objects in order to the frontend so I can loop through the array and generate HTML elements with classes, so I can apply styling as needed.
And I want to be able to specify any markdown within, e.g.,
Hello how [t- are] you [k- today], Sir?
Where t- is target, k- is key.
So the final array I'd like would look like:
[
[
type => 'normal'
content => 'Hello how '
],
[
type => 'target'
content => 'are'
],
[
type => 'normal'
content => ' you'
]
[
type => 'key'
content => 'today'
]
[
type => 'normal'
content => ', Sir?'
]
]
Here's my wordObjects function as of now:
private function setWordObjects($array, $type)
{
return array_map(function ($n) use ($type) {
return [
'type' => $type,
'content' => $n[0],
'index' => $n[1]
];
}, $array[1]);
}

Answer 1

With preg_match_all
$str = 'Hello how [t- are] you [k- today], Sir?';
$types = ['' => 'normal', 't' => 'target', 'k' => 'key'];
if ( preg_match_all('~ (?| \[ (?<type>[^]-]+) - \h (?<content>[^]]+) ]
| () ([^[]+) ) ~x', $str, $matches, PREG_SET_ORDER) ) {
foreach ($matches as &$m) {
unset($m[0], $m[1], $m[2]);
$m['type'] = $types[$m['type']];
}
print_r($matches);
}
demo

Answer 2

Extended solution:
$s = 'Hello how [t- are] you [k- today], Sir?';
$types = ['t-' => 'target', 'k-' => 'key'];
$splitted = preg_split('/\[([tk]- [^]]+)\]/', $s, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_OFFSET_CAPTURE);
$result = [];
foreach ($splitted as $v) {
[$content, $pos] = $v;
$k = substr($content, 0, 2);
$is_delim = isset($types[$k]);
$result[] = array_combine(['type', 'content', 'index'],
[$is_delim? $types[$k] : 'normal',
$is_delim? substr($content, 3) : $content,
$is_delim? $pos + 3 : $pos]);
}
print_r($result);
The output:
Array
(
[0] => Array
(
[type] => normal
[content] => Hello how
[index] => 0
)
[1] => Array
(
[type] => target
[content] => are
[index] => 14
)
[2] => Array
(
[type] => normal
[content] => you
[index] => 18
)
[3] => Array
(
[type] => key
[content] => today
[index] => 27
)
[4] => Array
(
[type] => normal
[content] => , Sir?
[index] => 33
)
)