PHP Regular Expression - Get number from string

Question

I have a string sequence that goes like this: <x:object*10/>. I want to replace that tag with something else that depends on what number it is. I match the tag above with /<x:object\*[0-9]+\/>/ and using preg_replace i can replace it all with the content I want. I just need that number now.

How can I get the number please?

It's a custom thingy from the CMS that tells the output parser to replace that with an object (Photo Gallery, VideoPlayer, AudioPlayer etc), having an ID of 10. — Francisc
– Francisc, Commented Mar 7, 2011 at 10:33
This is invalid XML though. Element names may not contain * characters. If you'd use well formed XML you wouldn't have to use Regex but could use a proper XML parser, like DOM. — Gordon
– Gordon, Commented Mar 7, 2011 at 11:01
That's true, I could just replace the star with :, but that never gets output. The parser changes that to a series of DIV elements and image tags etc. — Francisc
– Francisc, Commented Mar 7, 2011 at 11:54
That would be equally invalid XML. Strange parser you have there. — Gordon
– Gordon, Commented Mar 7, 2011 at 22:31

Gelmir · Accepted Answer · 2011-03-07 10:20:24Z

4

By capturing it:

/<x:object\*(?P<my_number>[0-9]+)\/>/

It will be captured with name "my_number"...

Full code would be sth like this:

<?php
preg_match_all(`/<x:object\*(?P<my_number>[0-9]+)\/>/`, $where_to_search, $matches);
var_dump($matches); // Dump the matches to see in detail.
?>

answered Mar 7, 2011 at 10:20

Gelmir

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Nick Weaver · Accepted Answer · 2011-03-07 10:21:17Z

2

Try this one :)

/<x:object\*([0-9]+)\/>/

answered Mar 7, 2011 at 10:21

Nick Weaver

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Comments

xkeshav · Accepted Answer · 2011-03-07 10:44:21Z

0

better use

/<x:object\*([0-9]+)\/>/

edited Mar 7, 2011 at 10:44

answered Mar 7, 2011 at 10:20

xkeshav

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10 Comments

Francisc Over a year ago

Hi, why add the extra forward slash?

xkeshav Over a year ago

bcoz * have diffrenet meaning in regex and u have * in ur given string ,`` is escape character

Francisc Over a year ago

I know it has meaning in RegEx, that's why I'm escaping with with \*.

xkeshav Over a year ago

but u want to replace only numbers

Felix Kling Over a year ago

This is not a valid regular expression in PHP. /<x:object/ will be treated as the expression, and then PHP fill throw an error because * is not a valid modifier. And what purpose has ^ here?

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