Regex: Find only image urls in a string with PHP

Question

I have a very complex string and i want to find and replace all urls that end with .jpg, .png, or .gif with a static url. For example;

$string = "Lorem ipsum dolor sit amet, http://www.website.com/images/some.jpg; consul delicata comprehensam eos at. Mea rebum laudem deterruisset et, ex epicuri constituto his. Sea ad appareat democritum. http://www.anotherwebsite.com/images/some.png Omnis vituperata dissentiunt an duo. Sumo diceret lobortis at sed, singulis aliquando prodesset ex sit.";

$regex = ?;
$static_image_url= "http://new_image_url";

return preg_replace($regex, $static_image_url, $string);

Please note this string may be more complex than this, urls are dynamic and this is NOT HTML.

Thank you very much in advance.

Best Regards,

EDIT:

This one worked for this case;

return preg_replace('/https?:\/\/[^ ]+?(?:\.jpg|\.png|\.gif)/', $static_image_url, $string);

I'm middle of nowhere! studied and tried to edit this one but no luck stackoverflow.com/questions/7461922/… — user3213174
– user3213174, Commented Feb 11, 2014 at 22:04
Try something like this to start with: regex101.com/r/nX1sN3 — scrowler
– scrowler, Commented Feb 11, 2014 at 22:11

Anonymous · Accepted Answer · 2014-02-11 22:10:43Z

1

This should replace the links as long as they don't have a space in them (since links clearly can't have spaces).

$string = "Lorem ipsum dolor sit amet, http://www.website.com/images/some.jpg; consul delicata comprehensam eos at. Mea rebum laudem deterruisset et, ex epicuri constituto his. Sea ad appareat democritum. http://www.anotherwebsite.com/images/some.png Omnis vituperata dissentiunt an duo. Sumo diceret lobortis at sed, singulis aliquando prodesset ex sit.";
$static_image_url= "http://new_image_url";
return preg_replace('/https?:\/\/[^ ]+?(?:\.jpg|\.png|\.gif)/', $static_image_url, $string);

answered Feb 11, 2014 at 22:10

Anonymous

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4 Comments

user3213174 Over a year ago

Thank you. I've found a very smilar one that worked. But yours seems much detailed.

Anonymous Over a year ago

The problem with yours is that it does not do what it should. For example, it replaces htt://test.jpg and http://www.the link.jpg and you're welcome.

user3213174 Over a year ago

Yes, yours definitely better!

Anonymous Over a year ago

Thanks. Good luck with your program. Also, if you want to allow spaces in links, you can just replace the [^ ] with ..

Schleis · Accepted Answer · 2014-02-11 22:36:54Z

0

For figuring out a regex, use the online tools for testing out your string.

http://www.regextester.com.

Since in your example string all your links start with "http://" we can start our pattern with that. We know that they are going to end in the extension of the file type (jpg, png) and a whole mess of stuff in between.

http:\/\/.+?(\.jpg|\.png|\.gif)

Using .+ will match anything and appending ? makes it ungreedy. Otherwise, we will get everything from the beginning of the first link to the end of the last.

Warning This regex is based on your example string. If the links are 'www.someplace.com/someimage.jpg' it won't be matched

edited Feb 11, 2014 at 22:36

answered Feb 11, 2014 at 22:10

Schleis

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1 Comment

Anonymous Over a year ago

This would incorrectly replace links such as http://www.website.com/images/somejpg. Also, you forgot .gif.

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