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Q: ASIN replace text ( Answered 5 out of 5 stars,   0 Comments )
Subject: ASIN replace text
Category: Computers > Programming
Asked by: pulplitcom-ga
List Price: $10.00
Posted: 23 Apr 2004 11:29 PDT
Expires: 23 May 2004 11:29 PDT
Question ID: 334999

What I'd like is a ereg_replace example written in php, so that if
given the text <ASIN="2844140858">Book Title</ASIN>

the ereg_replace will return <a

Subject: Re: ASIN replace text
Answered By: eiffel-ga on 24 Apr 2004 03:56 PDT
Rated:5 out of 5 stars
Hi pulplitcom,

Assuming that your original text is in the variable $a, you can use
the following function call to convert the <ASIN> tag to the hyperlink
that you need:

    '<a href="\\1/refferer_ID">\\2</a>',

In the replacement string (the second string passed to ereg_replace)
the escape code \\1 represents the book number and \\2 represents the
book title (because we have enclosed those parts in parentheses in the
search string regular expression).

Here's a small PHP program that can be run from the command line to
illustrate how this all works. I checked it using PHP 4.3.3 under
Fedora Core 1 Linux:


function asin_replace($a) {
   return ereg_replace('<ASIN="([0-9X]*)">(.*)</ASIN>',
    '<a href="\\1/refferer_ID">\\2</a>',

echo asin_replace('<ASIN="2844140858">Book Title</ASIN>') . "\n";


Here is the output of this program when run from the command line:

Content-type: text/html
X-Powered-By: PHP/4.3.3

<a href="">Book

I trust that this meets your requriements. Please request
clarification if there is any problem.

Additional references:

PHP: ereg_replace - Manual

Google Search Strategy:

php ereg_replace

php "define a function"


Request for Answer Clarification by pulplitcom-ga on 24 Apr 2004 16:26 PDT
This is outside the scope of the original question, but if possible
I'd like to ask a follow up question.

If $a = "<ASIN="2844140858">Test1</ASIN> Some other text.


Ending text.",

the ereg_replace on the whole text outputs

<a href="">Test1</ASIN>
Some other text.<ASIN="2844140858">Test2</a>Ending text.

Is there an easy way to apply the ereg_replace any number of
<ASIN></ASIN> statements so that instead thte </ASIN> will be replaced
by </a> in any number of instances?



Clarification of Answer by eiffel-ga on 25 Apr 2004 02:56 PDT
Hi pulplitcom,

If you want to replace all the occurrences of <ASIN>...</ASIN> at
once, you can use the preg_replace function.

However, preg-replace uses PERL-syntax regular expressions rather than
POSIX-syntax regular expressions as used by ereg_replace.

That's probably enough information for you to get it to work. However,
if you would prefer me to do that for you, you could post a new
question with "For eiffel-ga" in the subject line, and I can test it
out to see what (if any) differences will be necessary in the regular
expression. I don't know the answer off the top of my head, as I
normally use the POSIX forms.

pulplitcom-ga rated this answer:5 out of 5 stars
Perfect. Worked like a charm. Many thanks. Also, appreciate the clear
explanation; was beating my head against a wall trying to figure out
regular expressions myself.

There are no comments at this time.

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