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many rows of html text, want a value from each line

Posted on 2013-06-16
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Last Modified: 2013-07-09
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here

many lines
please tell me how to get
want-this-number
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Question by:rgb192
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7 Comments
 
LVL 35

Expert Comment

by:Terry Woods
ID: 39252118
For the exact text provided, this should work:
preg_match_all('#(?<=<a href="/start\.php\?a=request-link&amp;s=new-york&amp;f=intake&amp;l=)\d+#',$text,$matches);
print_r($matches);

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LVL 35

Expert Comment

by:Terry Woods
ID: 39252120
You could also be more flexible in the URLs you accept, such as:

preg_match_all('#<a href="/start\.php[^"]*(?:\?|&amp;)l=(\d+)#',$text,$matches);
print_r($matches[1]);

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LVL 109

Accepted Solution

by:
Ray Paseur earned 500 total points
ID: 39252957
Please see http://www.laprbass.com/RAY_temp_rgb192.php

The important part of this question is not so much the part you want to extract, but instead it is the set of rules that describe the surrounding data.  In this case the rules can be inferred from the test data sample, and the test data sample shows exactly the same surrounding data for each element you want.  Maybe that's good enough, but it might be a more interesting and useful question if you got some of the live data and used that for your test set.  Just a thought... ~Ray

<?php // RAY_temp_rgb192.php
error_reporting(E_ALL);

// SEE http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28158846.html

$txt = <<<EOD
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
EOD;


// START SIGNAL
$a = 'l=';

// STOP SIGNAL
$z = '"';

// MAKE AN ARRAY BY BREAKING STRING ON START SIGNAL
$arr = explode($a, $txt);
unset($arr[0]);

// USE THE STOP SIGNAL TO DECLOP THE ELEMENTS OF THE ARRAY
foreach ($arr as $sub)
{
    $sub = explode($z, $sub);
    $out[] = $sub[0];
}

// SHOW THE EXTRACTED SUBSTRINGS
print_r($out);

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Author Comment

by:rgb192
ID: 39259997
Terry's code
Array ( ) Array ( [0] => Array ( ) )


<?php

$text = <<<EOD
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
text here<a href="/start.php?a=request-link&amp;s=new-york&amp;f=intake&amp;l=want-this-number"><img src="/images/start.gif" alt="Start"></a>more text here
EOD;
  preg_match_all('#<a href="/start\.php[^"]*(?:\?|&amp;)l=(\d+)#',$text,$matches);
print_r($matches[1]);


preg_match_all('#(?<=<a href="/start\.php\?a=request-link&amp;s=new-york&amp;f=intake&amp;l=)\d+#',$text,$matches);
print_r($matches);

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Author Comment

by:rgb192
ID: 39260003
Ray has the correct answer, not sure if Terry has correct answer

I opened another question asking why Ray's code works
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28161784.html
0
 

Author Comment

by:rgb192
ID: 39274903
did I implement Terry's code correctly?
0
 

Author Closing Comment

by:rgb192
ID: 39313192
Ray had the only answer that I knew how to use.

Thanks
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