Regex for detecting hyperlink (PHP) [duplicate]

Question

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extract all <a> tags from content

i am fetching website contents using curl (PHP) and then perform a check if it contains a string. I would like to check if this string is a hyperlink or not. Does anybody know the correct regex/code to perform this?

Many Thanks,

J

do you mean "contains an URL" or "contains an html hyperlink <a src="....">xxxx</a>" ? — kappa
– kappa, Commented Apr 19, 2012 at 8:39

Daan · Accepted Answer · 2012-04-19 08:39:20Z

4

You want to use PHP's filter_var function. For example: filter_var('http://example.com', FILTER_VALIDATE_URL, FILTER_FLAG_PATH_REQUIRED)

answered Apr 19, 2012 at 8:39

Daan

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Jibril Salad Over a year ago

Thanks for the reply. How can i use the filter_var to find if the url is a hyperlink i.e it contains <a href. So the first thing is to check whether the url is in the content/string then if the url is a hyperlink.

Daan Over a year ago

In that case you probably want to combine filter_var with stackoverflow.com/questions/6568917/… as suggested by @Quentin above

Jibril Salad Over a year ago

Thanks for the reply. When i try as advised in stackoverflow.com/questions/6568917/… i get the following error: DOMDocument::loadHTML() [domdocument.loadhtml]: ID top already defined in Entity, line: 41 I am passing a string directly from curl_exec into loadHTML, do i have to do any conversion before that?

Daan Over a year ago

That means you're trying to parse invalid HTML. See stackoverflow.com/questions/2702799/php-parsing-invalid-html for some code that shows how you can fix this error

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