Link being overwritten incorrectly when using preg_replace

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I have a regular expression array that I use to replace url’s/hashtags in links using preg_replace:

$regs = array('!(\s|^)((https?://|www\.)+[a-z0-9_./?=;&#-]+)!i', '/#(\w+)/');
$subs = array(' <a href="$2" target="_blank">$2</a>', '<a href="/hashtag/$1" title="#$1">#$1</a>');

$saida = preg_replace($regs, $subs, $conteudo);

If, the $conteudo have a link, for example: https://www.google.com/, it replaces correctly; if you have a hastag followed by text, for example #nightclub also replaces, however, if you have a link that has a hashtag, for example: https://www.google.com/#top the replacement is as follows::

#top" target="_Blank">https://www.google.com/#top

only the parts in bold are links.

How to fix?

php regex preg-replace

  • the regexto url wouldn’t be ^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?

  • I’m using the one I got in another question here at Stackoverflow, @Maiconcarraro. I’m a beginner in regex, however, the one I am using works properly, taking away the problem in question...

1 answer

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You can use a lookbehind assertion to check whether the hashtag has a space before:

/(?<=\s)#(\w+)/

The substitution does not change because the groups started with (? are not captured

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