What are some common pitfalls when using regular expressions in PHP, as seen in the forum thread?

One common pitfall when using regular expressions in PHP is not properly escaping special characters. To avoid this issue, always use the `preg_quote()` function to escape any characters that have special meanings in regular expressions. 

// Incorrect way without escaping special characters
$pattern = '/[.*]/';

// Correct way with escaping special characters
$pattern = '/'. preg_quote('[.*]', '/') .'/';

Keywords

regular expressions PHP syntax errors backslashes escaping

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