Problems using preg_replace

Question

Regx is not my thing.

I have a large file where I want to replace the following example:

<g:id><![CDATA[131614-3XL]]></g:id>

should be replace with:

<g:id><![CDATA[131614-3XL]]></g:id><g:id2><![CDATA[131614]]></g:id2>

Please note that "-3XL" is deleted in id2 and please note that -3XL could be many other combinations. fx. -4XL or -32/32 or -42,5 and so on. But it always starts with -

I have tried using preg_replace but I can figure it out.

As long as "<g:id><![CDATA[131614-3XL]]></g:id>" doesn't change in the string that you want to replace, you can achieve that using a simple string replace, here is the documentation: php.net/manual/en/function.str-replace.php — Marcello Perri
– Marcello Perri, Commented Mar 3, 2023 at 16:21
@MarcelloPerri That won't work. please note that -3XL could be many other combinations — user3783243
– user3783243, Commented Mar 3, 2023 at 16:24
Don't use regular expressions to manipulate XML or HTML. Use DOMDocument. — Barmar
– Barmar, Commented Mar 3, 2023 at 16:53

Barmar · Accepted Answer · 2023-03-03 17:09:06Z

0

Use a capture group to grab the number in the CDATA so you can copy it to the replacement without the -XXX after it.

$result = preg_replace('#<g:id><!\[CDATA\[(\d+)-[^]]+\]\]></g:id>#', '$0<g:id2><![CDATA[$1]]></g:id2>', $string);

$0 is the entire match, $1 is the number in the CDATA.

DEMO

answered Mar 3, 2023 at 17:09

Barmar

789k57 gold badges555 silver badges669 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

vaughnskinner · Accepted Answer · 2023-03-03 17:04:01Z

0

Here is code that you can start with. You might need to adjust depending upon how much the CDATA content changes.

$str = "<g:id><![CDATA[131614-3XL]]></g:id>";
$expected = "<g:id><![CDATA[131614-3XL]]></g:id><g:id2><![CDATA[131614]]></g:id2>";

# Get the first section without the g:id wrapper and without the -3XL section
$post_replace = preg_replace("/^<g:id>(.*?CDATA\[\d+)\-[^\]]+(.*?)<\/g:id>$/","$1$2", $str);

$output = "$str<g:id2>$post_replace</g:id2>";

if ($output == $expected) {
    print "Success\n";
}

answered Mar 3, 2023 at 17:04

vaughnskinner

11 bronze badge

Collectives™ on Stack Overflow

Problems using preg_replace

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related