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Regex pattern for sentence with word in

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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,


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

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