RE: [PHP] (Newbie) String within a string

original question jalist: > > I'm trying to grab a string from within a string based on a matching word > > or phrase. In the middle of the night i was thinking hey, why not use a regexp, look for the pattern word-space-word-space-SEARCHWORD-space-word-space-word something like $toshow = regexp ( "( [alphanum]+ [alphanum]+ [$YOURWORD] [alphanum]+ [alphanum]+ )", $totalstring); I am totally bad with regexps, but that 's the idea. Might be faster than the array? You'll have to take care of comma's etc. From: "jalist" <jalist@ls2k.org> To: "PHP" <php-general@lists.php.net> Date sent: Thu, 18 Jan 2001 16:12:31 -0000 Subject: RE: [PHP] (Newbie) String within a string > Excellent, thanks a lot Chris. > > Steve > (jalist) > jalist@ls2k.org > http://ls2k.org > > -----Original Message----- > From: Chris Hayes [mailto:chayes@antenna.nl] > Sent: 18 January 2001 15:43 > To: jalist; PHP > Subject: Re: [PHP] (Newbie) String within a string > > > > jalist: > > I'm trying to grab a string from within a string based on a matching word > or > > phrase. Example... > > You say you want the middle, not two words before and two words after. > > I see several ways. > > > 1. Explode into an word-array and use that: > 1. prepare string > a) add spaces after comma's and fullstops by some replace > operation (replace ',' by ', '). > b) remove double spaces > 2. split to an array using explode (space as string separator) > Now you have every word in a separate place in the array > 3. Get # of words by count($array) > 4. Divide by two and get nearest integer (hence floor and +0.5!) > $mid= floor(count($array)/2 + 0.5) > OH NO, correction, that's the middle, you wanted a specific word. > I'm afraid you'll have to walk thorugh the array to find the word > you need. > > for (i=0;i<count($array);i++) > { > if ($array[$i]==$searchword) > { $fragment= "...". > $array[$mid-2] ." " > $array[$mid-1] ." " > $array[$mid] ." " > $array[$mid+1] ." " > $array[$mid+2] ."..."; > ##extra job for you: make sure $i >= 2 > ## and $i <= count-2 > ## or you'll get an error > > [exit the for loop somehow, maybe drop > this in a function and RETURN;] > } > > } > > > > OR > > 2. Continue with the strpos and strrpos, organize it a bit better. > For instance find the middle of the string. Split at nearest > space in leftstring and rightstring. > > Make a function chop_last_word, chop last two or three words from > leftstring and add to resultstring in right order. > > Same for rightstring. > > I think the array way is cleaner. > > Chris > > -------------------------------------------------------------------- > -- C.Hayes Droevendaal 35 6708 PB Wageningen the Netherlands -- > -------------------------------------------------------------------- > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net -------------------------------------------------------------------- -- C.Hayes Droevendaal 35 6708 PB Wageningen the Netherlands -- --------------------------------------------------------------------