How can escaping and context switching be utilized to avoid errors in preg_grep expressions?

Escaping special characters and properly switching contexts can help avoid errors in preg_grep expressions. When using preg_grep, it's important to escape any special characters that might be misinterpreted, such as slashes or dots. Additionally, switching contexts by using single quotes instead of double quotes can prevent unexpected variable interpolation. 

$pattern = '/\bexample\.com\b/';
$array = ['example.com', 'test.com'];

$filtered_array = preg_grep($pattern, $array);

print_r($filtered_array);

Keywords

escaping context switching preg_grep errors expressions

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