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Substr

Posted on 1998-09-05
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Last Modified: 2010-07-27
I have some srings like
<br><a href="test.htm"><b>Some Text</b></a>
and
<br><a href="testgetmore.htm"><b>More Text</b></a>

i want to get the substring after <b> and before </b> but the position of "<b>" is on a defrent position in the string
how do i get the position of the <b> and how do u use substr?

Thanks

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Question by:delpro
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4 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 1204700
($substring) = $string =~ m|<b>(.*?)</b>|;

#to get the position of the <b>
$position = index $string,'<b>';
#to use substr
$substring = substr $string,$position+3;
#or
$substring = substr $string,$position+3,(index $string,'</b>')-$position-3;
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LVL 28

Accepted Solution

by:
sybe earned 0 total points
ID: 1204701
sub ExtractBetween
{
  local($string, $tag1, $tag2) = @_;
  $ind1 = index($string, $tag1) + length($tag1);
  $ind2 = index($string, $tag2);
  $string = substr($string,$ind1,$ind2-$ind1);
  return $string;
}


$yourstring = '<br><a href="test.htm"><b>Some Text</b></a>';
$extractedstring = ExtractBetween($yourstring,'<b>','</b>');

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LVL 84

Expert Comment

by:ozo
ID: 1204702
#If you're going to use it in a sub, then perhaps
 $ind2 = index($string, $tag2);
#would be be safer as
 $ind2 = index($string, $tag2, $ind1);
#so that
ExtractBetween('</b><br><a href="test.htm"><b>Some Text</b>',<b>','<');
#still works

#although for literal tags,
($extractedstring) = $yourstring =~ m|<b>(.*?)</b>|;
#still seems easier
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LVL 28

Expert Comment

by:sybe
ID: 1204703
I wrote my answer as ozo posted his comment, so i did not see his first comment.
Anyway, I agree with ozo that his answer is easier.

ozo, you're a real perl-magician !

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