[RESOLVED] preg_replace question

[2005]

What is the difference between:

$do = preg_replace("/[^a-z]/", "", $do);

and

$do = preg_replace("/([^a-z])/", "", $do);

both of them works to remove non-alphabetic characters.

[laserlight]

There is no difference here. By the way, use single quotes for regular expression patterns: that allows you to simplify when you write more complex expressions that contain characters that would otherwise need to be escaped.

[2005]

Thank you laserlight.

I just opened another thread about single and double quotes because there are a lot of questions for me.