Solved

Substr

Posted on 1998-09-05
4
284 Views
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

0
Comment
Question by:delpro
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
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;
0
 
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>');

0
 
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
0
 
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 !

0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I have been pestered over the years to produce and distribute regular data extracts, and often the request have explicitly requested the data be emailed as an Excel attachement; specifically Excel, as it appears: CSV files confuse (no Red or Green h…
There are many situations when we need to display the data in sorted order. For example: Student details by name or by rank or by total marks etc. If you are working on data driven based projects then you will use sorting techniques very frequently.…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…

738 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question