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        $regex = '/\b'.$keyword.'\b/i'; // case insensitive match
        if (preg_match($regex, $linkedin_html) == 0)
            $this->_htmlValidationFailed++;
            continue;                
When I use this code.. i get error as unknown modifier 'v'.. 
pls let me know what is the problem and help me rectify.
                Impossible to answer unless you show us what the value of $keyword is. I suspect, like David, it contains something the REGEX engine is attempting to parse as REGEX grammar.
– Mitya
                Jul 9, 2012 at 11:44
                we cant know what $keyword is beforehand.. it is some required information fetched from internet while running the code.. and each time it varies for different input.
– Naren Karthik
                Jul 9, 2012 at 11:46
$keyword = preg_quote( $keyword, '/' );
$regex = '/\b'.$keyword.'\b/i'; // case insensitive match
if (preg_match($regex, $linkedin_html) == 0)
   $this->_htmlValidationFailed++;
   continue;                
                thanks berry.. but now it says..Warning: preg_match(): Compilation failed: regular expression is too large at offset #######.
– Naren Karthik
                Jul 9, 2012 at 11:55
                @NarenKarthik Well, I'm guessing that means that your regular expression is too large ;)  If you're just testing for keywords, maybe a loop with strstr is a better fit than a regular expression?
– Berry Langerak
                Jul 9, 2012 at 13:06