How can regular expressions (RegEx) be effectively used in PHP to search for patterns or specific content within a text block?

Regular expressions (RegEx) can be effectively used in PHP to search for patterns or specific content within a text block by using functions such as `preg_match()` or `preg_match_all()`. These functions allow you to define a pattern to search for and then apply it to the text block to find matches. By using RegEx, you can perform complex searches and extract specific information from a text block with ease. 

$text = "The quick brown fox jumps over the lazy dog.";
$pattern = '/\b[brown|lazy]+\b/';
if (preg_match($pattern, $text, $matches)) {
    echo "Match found: " . $matches[0];
} else {
    echo "No match found.";
}

Keywords

Regular expressions RegEx PHP search patterns text block.

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