PHP: Making an excerpt with regular expression

I am trying to make an excerpt of my content by matching this - [...]

$content_filtered = preg_replace("/<p>(.*?)\[...\](.*?)<\/p>/is", "<p>$1...</p>[...]<p>$2</p>", $item['pg_content_1']);

and then explode this [...]

$array_content = explode('[...]', $conte开发者_高级运维nt_filtered);

to produce the excerpt,

$content_current = $array_content[0]; 

it works fine with when I use [...] like this,

<p>Lorem Ipsum is simply dummy text of[...] the printing and typesetting industry.</p>

it will produce something like this,

Lorem Ipsum is simply dummy text of...

but if I put a white space before the [...],

<p>Lorem Ipsum is simply dummy text of [...] the printing and typesetting industry.</p>

then the dots will have a white space in the excerpt,

Lorem Ipsum is simply dummy text of ...

how can I get rid of that white space?

I think I must to something with the regular expression in this line below but I don't know how!

preg_replace("/<p>(.*?)\[...\](.*?)<\/p>/is", "<p>$1...</p>[...]<p>$2</p>", $item['pg_content_1']);

Please let me know if you have any ideas!

Thanks.

Try capturing the whitespace before [...] and ignore it with ?:

"/<p>(.*?)(?:\s*)\[...\](.*?)<\/p>/is"