How can PHP developers ensure that their regular expressions accurately capture the desired image URLs while avoiding false positives?

To ensure that PHP developers accurately capture the desired image URLs while avoiding false positives, they can use specific patterns in their regular expressions that match the expected format of image URLs. By defining the pattern to include common image file extensions such as .jpg, .png, or .gif, developers can filter out unwanted matches. Additionally, developers can use anchors like ^ and $ to ensure that the regular expression matches the entire URL and not just a part of it.

// Example PHP code snippet to match image URLs with specific file extensions
$pattern = '/https?:\/\/.*\.(jpg|jpeg|png|gif)/i';
$url = 'https://example.com/image.jpg';

if (preg_match($pattern, $url)) {
    echo 'Valid image URL found';
} else {
    echo 'Not a valid image URL';
}