Regex Multiple elements one string

Question

I have the following string...

Out with the <_link>user://1|Team GB  for
<_link>tag://FridayBeers|#FridayBeers

And I have written the following regex which strips out the tags and characters.

~<(/){0,1}.*?( /){0,1}>|(tag://\w*\||user://[0-9]*\|)~

However what I now need to achieve is the following

<_link>user://1|Team GB gets converted to <a href="user/1">Team GB</a> and for <_link>tag://FridayBeers|#FridayBeers to <a href="tags/FridayBeers">#FridayBeers</a>

Can some post an answer that changes my regex to allow for this I am using PHP;

$post_text = "Out with the <_link>user://1|Team GB  for <_link>tag://FridayBeers|#FridayBeers";
$pattern = "~<(/){0,1}.*?( /){0,1}>|(tag://\w*\||user://[0-9]*\|)~"; //"~<(/){0,1}.*?( /){0,1}>|(tag://\w*\||user://[0-9]\|)~";
$replacement = " ";
$regexd = preg_replace($pattern, $replacement, $post_text);

@kelunik thanks for the tip, could you post an answer with a code sample showing how you would do this, I appreciate it — Justin Erswell
– Justin Erswell, Commented Feb 9, 2014 at 15:04

kelunik · Accepted Answer · 2014-02-09 15:31:34Z

1

You can achieve this using preg_replace_callback. The following code sample is just a minimal sample (see notice below).

<?php

$pattern = "~\<_link\>((?<typeUser>user)\://(?<userId>\d+)\|(?<userName>[a-zA-Z]+)|(?<typeTag>tag)\://(?<tagLink>[a-zA-Z]+)\|#(?<tagTitle>[a-zA-Z]+))~";
$string = "<_link>user://1|Team GB and <_link>tag://FridayBeers|#FridayBeers";

echo preg_replace_callback($pattern, function($match) {
    if(!empty($match['typeUser'])) {
        return '<a href="user/'.$match['userId'].'">'.$match['userName'].'</a>';
    } else {
        return '<a href="tags/'.$match['tagLink'].'">'.$match['tagTitle'].'</a>';
    }
}, $string);

This code doesn't care about escaping HTML. Additionally the pattern only cares about names without spaces.

answered Feb 9, 2014 at 15:31

kelunik

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3 Comments

Justin Erswell Over a year ago

That seems to work well and thank you however some of the names as per the example have spaces in them for example my name Justin Erswell anyway of dealing with that?

kelunik Over a year ago

You need something to make clear there's the end of the name. Imagine the following input: <_link>user://1|Team GB was the ... team. Should was stick to the name or not? How should your script know?

Justin Erswell Over a year ago

You are right of course this is a little tricky unfortunately I am stuck with the data. Thanks for your help!

anubhava · Accepted Answer · 2014-02-09 15:34:26Z

1

Consider this preg_replace code:

$s = '<_link>tag://FridayBeers|#FridayBeers';
$r = preg_replace('~<_link>([^:]+)://([^|]+)\|([\w -]+)~', '<a href="$1/$2">$3</a>', $s);
//=> <a href="tag/FridayBeers">#FridayBeers</a>

answered Feb 9, 2014 at 15:34

anubhava

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