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Dear Exprt,

I would like to replace the following string ,

Case-1
url('/images/gradientbottom.jpg') to
url('http://www.example.com/images/gradientbottom.jpg') in preg_replace in php

OR
Case-2
url("/images/gradientbottom.jpg") to
url("http://www.example.com/images/gradientbottom.jpg") in preg_replace in php

OR
case-3
url(images/gradientbottom.jpg) to
url(http://www.example.com/images/gradientbottom.jpg) in preg_replace in php

OR
case-4
url(/images/gradientbottom.jpg) to
url(http://www.example.com/images/gradientbottom.jpg) in preg_replace in php


How to make it? I tried the following regexpression by reg_repace  in php for case-1  but it fail it always echo
the same output $buffer as url('/images/gradientbottom.jpg') , any idea ? , it is really hard for regexp
for bracket speical character "(" or "(......0";  Please advise

Duncan

<?php
$url="http://www.example.com";
$buffer=url('/images/gradientbottom.jpg');
$buffer= preg_replace('/(?<=url()[^)]+(?=))/x', 'url()'.$url.'(?=)', $buffer);
echo $buffer;  //***********expect result:url('http://www.example.com/images/gradientbottom.jpg')
?>

Given what we have to work with, this shows the general design.  Add other <div> tags after line 7 to expand the scope of your tests.  If your HTML is valid, you would only ever need to use single quotes inside the :url() part of the tag.  The code works correctly with the one line of test data, but for obvious reasons (if it were my task) more tests would be better.

To see the general thought processes that go into something like this, please read the article on test-driven development.
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_7830-A-Quick-Tour-of-Test-Driven-Development.html

Best regards, ~Ray

<?php // RAY_temp_duncanb7.phperror_reporting(E_ALL);echo "<pre>";// TEST DATA$strs = <<<ENDSTRS<div style="width:100%;clear:both;margin:0;padding:0;background-color:transparent;background-image:url('/images/gradientbottom.jpg');background-repeat:repeat-x;position:relative;top:65px;">ENDSTRS;// THE FULLY QUALIFIED DOMAIN$url = 'http://example.com';// MAKE A REGEX TO ISOLATE THE URL$rgx= '#'            // REGEX DELIMITER. '^'            // START OF STRING. '('            // START GROUP. '.*?:url('    // ANYTHING THROUGH "URL(" WITH PAREN ESCAPED. ')'            // END GROUP. '"?'           // OPTIONAL QUOTE. "'?"           // OPTIONAL APOSTROPHE. '(.*?)'        // GROUP OF ANYTHING. '"?'           // OPTIONAL QUOTE. "'?"           // OPTIONAL APOSTROPHE. '().*?)'      // GROUP THROUGH END OF STRING WITH LEADING PAREN ESCAPED. '$'            // END OF STRING. '#'            // REGEX DELIMITER;// TRIM AWAY NOISE AND MAKE AN ARRAY FROM THE LINES$arr = explode(PHP_EOL, trim($strs));// ITERATE OVER THE ARRAY TO EXTRACT THE PARTSforeach ($arr as $str){    preg_match($rgx, trim($str), $mat);    // ACTIVATE THIS LINE TO SEE WHAT THE REGEX DID    // var_dump($mat);    // REASSEMBLE THE MATCHED PARTS WITH THE DOMAIN    $new[]    = $mat[1]    . "'"    . $url    . $mat[2]    . "'"    . $mat[3]    ;}// SHOW THE WORK PRODUCTecho PHP_EOL . htmlentities($strs);echo PHP_EOL;foreach ($new as $div){    echo PHP_EOL . htmlentities($div);}                                          

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