PHP Regular expression to replace link url

Question

I need to add href=" before an http:// if this http:// doesn't follow href=" or src="

Following code partly works. Partly means it considers <a href=" only but not src="

$str= preg_replace( 
    "/(?<!a href=\")((http|ftp)+(s)?:\/\/[^<>\s]+)/i", 
    "<a href=\"\\0\"> target=\"blank\">\\0</a>", 
    $str
);

Thank you guys in advance for your reply.

See http://stackoverflow.com/questions/4003031/regex-replacing-text-url-but-exclude-image-url — Gumbo, Oct 27 '10 at 20:03
You also do not want to replace the URL if it is part of an anchor element, e.g. `http://example.com` — Gordon, Oct 27 '10 at 21:13
Or a `link`, or a `meta`, or part of a `script`, etc., etc., etc., rant, rant, rant, conclusion: use a parser. — Wrikken, Oct 27 '10 at 23:04
Thank you Gordon. These are good thoughts. I will do it when my boss finds he needs it (to let my boss know he needs a programmer....) — Dustin Sun, Oct 29 '10 at 16:11
possible duplicate of [Can you provide some examples of why it is hard to parse XML and HTML with a regex?](http://stackoverflow.com/questions/701166/can-you-provide-some-examples-of-why-it-is-hard-to-parse-xml-and-html-with-a-rege) — Brad Mace, Jul 09 '11 at 20:58
possible duplicate of [RegEx match open tags except XHTML self-contained tags](http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags) — Paŭlo Ebermann, Sep 15 '11 at 14:12

score 7 · Accepted Answer · edited Jun 25 '12 at 09:19

7

$str= preg_replace( 
    "/(?<!a href=\")(?<!src=\")((http|ftp)+(s)?:\/\/[^<>\s]+)/i", 
    "<a href=\"\\0\" target=\"blank\">\\0</a>", 
    $str
);

edited Jun 25 '12 at 09:19

PiTheNumber

answered Oct 27 '10 at 20:02

chaos

1

Would be lovely if this included any sort of description / comments. Code-only answers are hard enough, but RegEx is a whole 'nother monster! – random_user_name Jul 09 '18 at 20:54

1 Answers1