php function array_key_exists and regular expressions

Hey there,

I've encountered a similar situation before where I needed to use regular expressions with `array_key_exists`. Unfortunately, the `array_key_exists` function itself doesn't support regular expressions for matching keys. It only checks if a given key string exists in the array.

To solve this problem, I used a combination of `array_filter` and `preg_grep` functions to achieve the desired functionality. Let me explain how:

First, I used `array_filter` to create a new array that only contains the keys from my original array that match the given regular expression pattern. Here's an example:

php
$pattern = '/^element\d+$/'; // Regular expression pattern

$matchedKeys = array_filter(array_keys($myArray), function($key) use ($pattern) {

    return preg_match($pattern, $key);

});

php
if (!empty($matchedKeys)) {

    // The array contains keys that match the pattern

    // Your code here

} else {

    // No matches found

}

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Hey everyone,

I stumbled upon this thread and thought I'd share a different approach that might be useful in this scenario.

Instead of using `array_key_exists` or a combination of `array_filter` and `preg_grep`, you can leverage the power of `preg_grep` directly to achieve what you're looking for. It's a handy function when dealing with array keys that match a specific pattern using regular expressions.

Here's an example of how you can use `preg_grep` to check if any keys in your array match a particular pattern:

php
$pattern = '/^element\d+$/'; // Regular expression pattern

$matchedKeys = preg_grep($pattern, array_keys($myArray));



if (!empty($matchedKeys)) {

    // A match was found

    // Handle the logic here

} else {

    // No matches found

}

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