Convert regex string to URL

Question

Im trying to convert words into URLs. the words are separated with a comma ,. But my problem is that the first word is not taken into account, because there is no comma infort of it.

public static function convertHashtags($str){
        $regex = "/,+([a-zA-Z0-9_]+)/";
        $str = preg_replace($regex, '<a href="'.Config::get('URL').'index/hashtag/$1">$0</a>', htmlentities($str));
        return($str);
    }

For example $str=june,mars,april results that only mars and april get URLed, not june.

anubhava · Accepted Answer · 2015-06-17 10:53:13Z

1

You can change your regex to:

$regex = '/(?<=,|^)([a-zA-Z0-9_]+)/';

to match line start or comma before your words.

You can shorten your regex to:

$regex = '/(?<=,|^)(\w+)/';

edited Jun 17, 2015 at 10:53

answered Jun 17, 2015 at 10:39

anubhava

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2 Comments

Adam Over a year ago

Thank you for your answer! but the URL looks like this now: index/hashtag/, its a comma instead of the word. And i made a mistake in my first post. There is no space between words. june,mars,april

Ismael Miguel Over a year ago

The m flag is useless in this example. It is used to tell . to also match newlines. Since you aren't using ., you can remove it.

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