Regex pattern for sentence with word in

[BRUm]

Hi,

I'm currently coding a search engine, and everything seems to be going smoothly, until I reach regular expressions -_- (I hate them so much..). So far, the script can crawl a site from an array, and grab a sentence with the keywords. However, it's a bit messy, and I wondered if someone would be so kind as to show a pattern that would do it properly.

Basically, I need a pattern that matches a sentence with letters and numbers only (to filter out HTML) and with the sentence must have this in: [code=php:0]$pieces[0][/code]

Here's the code I'm using at the moment: [code=php:0]/$pieces[0].*/[/code] I must say it's not too good.

Any help greatly appreciated,

Thanks.

[effigy]

[code]
if ( strstr($string, $pieces[0]) && preg_match('/^[A-Za-z0-9 .]$/', $string) ) { ... }
[/code]