PHP preg match / replace?

Question

I need to read the string $mysting and replace all incident of e.x.

<img src="dummypic.jpg alt="dummy pic">

with

<img src="dummypic.jpg alt="dummy pic" title="dummy pic">

in other words add the title where it is missing, and make the title tag have the same value as the alt tag.

some incident my have additional parameters like border, with, height - and these should be left untouched ...

tinyurl.com/cm8ea5 please post the code of what you have already tried if you need a quicker response from the community. — Aditya M P
– Aditya M P, Commented Mar 4, 2011 at 15:01
Just to note, title and alt are attributes, not tags. And technically image tags don't require a title attribute as the alt attribute is used by screen readers and when images are disabled to show a description of the image, but that's way not the point :-) — Alex
– Alex, Commented Mar 4, 2011 at 15:05
possible duplicate of RegEx match open tags except XHTML self-contained tags — RobertPitt
– RobertPitt, Commented Mar 4, 2011 at 15:09

Michael Berkowski · Accepted Answer · 2011-03-04 15:02:18Z

2

Rather than a regex, have a look into PHP DOMDocument to modify attributes, especially if there will be any complexity.

answered Mar 4, 2011 at 15:02

Michael Berkowski

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mario · Accepted Answer · 2011-03-04 15:04:40Z

2

You could use phpQuery or QueryPath to do that:

$qp = qp($html);
foreach ($qp->find("img") as $img) {
    $img->attr("title", $img->attr("alt"));
}
print $qp->writeHTML();

Though it might be feasible in this simple case to resort to an regex:

preg_replace('#(<img\s[^>]*)(\balt=)("[^"]+")#', '$1$2$3 title=$3', $h);

(It would make more sense to use preg_replace_callback to ensure no title= attribute is present yet.)

answered Mar 4, 2011 at 15:04

mario

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markijbema · Accepted Answer · 2011-03-04 15:01:11Z

0

You really want to do this using an html parser instead of regexes. Regexes are not suited for html processing.

answered Mar 4, 2011 at 15:01

markijbema

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2 Comments

mario Over a year ago

Please provide an example, not generic advise.

Aditya M P Over a year ago

well the OP did not post his code... i think it's very kind for anyone to be even answering.

Community · Accepted Answer · 2017-05-23 11:59:31Z

0

My answer is a link to a well known answer!

RegEx match open tags except XHTML self-contained tags

edited May 23, 2017 at 11:59

CommunityBot

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answered Mar 4, 2011 at 15:08

RobertPitt

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2 Comments

Ikke Over a year ago

That would fit better in a comment

RobertPitt Over a year ago

My answer is a referral to another answer, this fits the criteria for an answer perfectly IMO

John Himmelman · Accepted Answer · 2011-03-04 15:13:34Z

I usually write quick dirty hacks in these types of situations (usually working with structured data, that might have inconsistencies such as templating engine tags, conditionals, etc.). IMO its a terrible solution, but I can bang out these scripts super fast.

Eg.

<?
$html = '
<img src="dummypic.jpg" alt="dummy pic">
<img src="dummypic2.jpg" alt="dummy pic 2">

blahaahhh

<img src="dummypic.jpg" alt="dummy pic">
<img src="dummypic2.jpg" alt="dummy pic 2">
';

$tags = explode('<img', $html);

for ($i = 1; $i < count($tags); $i++)
{
    $src = explode('src="', $tags[$i]);
    $src = explode('"', $src[1]);
    $src = str_replace('.jpg', '', $src[0]);   

    $tags[$i] = '<img title="' . $src . '"' . $tags[$i];
}

echo implode('', $tags);

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