What are some common pitfalls to avoid when using regular expressions like preg_match() in PHP?

One common pitfall to avoid when using regular expressions like preg_match() in PHP is not properly escaping special characters. This can lead to unexpected results or errors in the regex pattern. To solve this issue, it's important to use the preg_quote() function to escape any special characters in the input string before using it in the regex pattern. 

$input = "Hello (World)";
$pattern = "/\(" . preg_quote("World") . "\)/";

if (preg_match($pattern, $input)) {
    echo "Match found!";
} else {
    echo "No match found.";
}

Keywords

regular expressions preg_match PHP syntax errors incorrect patterns

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