php replace string to html tag

Question

I want to display content in a php page from a .txt and change some tag to a html code like the following using:

Change this:

[img: something.jpg]

To this:

<img src="something.jpg" />

I've tried to use preg_replace, but I have no idea how to use those symbols like /(){}^*.:. What it means to use things like this to extract some variables $1 $2 from a string?

$string = 'April 15, 2003';
$pattern = '/(\w+) (\d+), (\d+)/i';

echo preg_replace("/\[img:\s*([^\]]+)\]/i","<img src='$1'>",$string) — Amit Verma
– Amit Verma, Commented Nov 21, 2015 at 5:10

Narendrasingh Sisodia · Accepted Answer · 2015-11-21 05:10:56Z

2

You can use the following regex like as

\[(\w+):\s?(\w+.\w+)]

Regex Explanation

\[ : \[ will check for [ literally.
(\w+): : (\w+) Capturing groups of any word character [a-zA-Z0-9_]. + Between one and unlimited times, as many times as possible, : will check for : literally
\s? : match any white space character [\r\n\t\f ]. ? Between zero and one time, as many times as possible
(\w+.\w+) : Capturing group of any word character [a-zA-Z0-9_]

So using preg_replace like as

echo preg_replace('/\[(\w+):\s?(\w+.\w+)]/',"<$1 src='$2' />","[img: something.jpg]");

Regex

Demo

edited Nov 21, 2015 at 5:10

answered Nov 21, 2015 at 5:00

Narendrasingh Sisodia

21.4k6 gold badges51 silver badges54 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Narendrasingh Sisodia Over a year ago

But OP didn't defined any of those scenarios @Starkeen. If OP identify any of these scenario I'll update as per required.

Rasclatt · Accepted Answer · 2015-11-21 05:21:43Z

2

@Uchiha has a great regex (+1 for it!), but you may want to use a preg_replace_callback() instead if you are wanting to use it for a [shortcode] type application:

function shortcode($val = false)
    {
        return (!empty($val))? preg_replace_callback('/\[(\w+):\s?(\w+.\w+)]/',function($matches) {
                if(!empty($matches[2])) {
                        switch($matches[1]) {
                                case ('img'):
                                    return '<img src="'.$matches[2].'" />';
                            }
                    }
            },$val) : false;
    }

echo shortcode('[img: something.jpg]');

answered Nov 21, 2015 at 5:21

Rasclatt

12.5k3 gold badges28 silver badges33 bronze badges

1 Comment

mickmackusa Over a year ago

That dot is an any character rather than a literal dot.

Collectives™ on Stack Overflow

php replace string to html tag

2 Answers 2

1 Comment

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related