Image proxy REGEX in PHP

Question

Using PHP.

I have an html document on a variable, I want to look inside this code for all instances of the img tag, and prepend some text to its src attribute, I want to avoid using client side code like javascript and let php handle all the heavy lifting, I was thinking of using regular expressions to do this, like find all instances of <img [ ]* src=" , Im not very savy on regex as you can see, how can I achieve this?

Thanks!

Don't use regexp to process HTML, use a DOM parsing library like Simple PHP DOM Parser. — Barmar, Feb 14 '14 at 20:37
[Probably not a good idea](http://stackoverflow.com/a/1732454/2370483) — Machavity, Feb 14 '14 at 20:37
I cant use a DOM parser, have to do it through regex. its how it was required — Carlos Villalta, Feb 14 '14 at 21:03

Stepan Grigoryan · Accepted Answer · 2014-02-14T23:46:44.520

0

This will match all img tags and capture the contents inside src which then you can use to replace with something prepended to it.

/\<img.+src="(.+)".*\/\>/

You can see how it's working here: http://www.phpliveregex.com/p/3Mk

edited Feb 14 '14 at 23:46

answered Feb 14 '14 at 22:05

Stepan Grigoryan

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score 0 · Answer 2 · answered Feb 14 '14 at 22:20

Use a DOM parser, they're simple and so much less error prone.

That said, it's Friday, and if this was a one off fix to correct some broken URLs (say the image directory got moved up a level) in a few HTML files, I'd be whipping out Notepad++ and doing a quick regex find and replace.

/(<img[^>]*src=")/i

Replacing with \1whatever:

preg_replace('/(<[^>]*src=")/i', '\1whatever', $subject);

Image proxy REGEX in PHP

2 Answers2