What are common errors associated with using regular expressions in PHP?

One common error when using regular expressions in PHP is forgetting to escape special characters. This can lead to unexpected behavior or errors in the regex pattern. To solve this, make sure to properly escape any special characters using backslashes before using them in the regex pattern.

// Incorrect regex pattern without escaping special characters
$pattern = "/[a-z]+./";

// Corrected regex pattern with escaped special characters
$pattern = "/[a-z]+\./";