How can PHP developers efficiently search for content within specific boundaries in a string using regular expressions?

PHP developers can efficiently search for content within specific boundaries in a string using regular expressions by using the preg_match() function with appropriate regex patterns. By defining the boundaries using anchors like ^ (start of string) and $ (end of string), developers can ensure that the search is limited to the desired section of the string. Additionally, capturing groups can be used to extract the desired content within the boundaries.

$string = "The quick brown fox jumps over the lazy dog";
$pattern = "/brown.*dog/";

if(preg_match($pattern, $string, $matches)){
    echo "Found: " . $matches[0];
} else {
    echo "Not found";
}