使用preg_replace删除除引号之间的内容之外的所有内容

Question

I've got the following shortcode that I'm trying to run a preg_replace on, to get the title value.

[tab title="Emergency Contact" important="true"]

Currently, I use the below filter:

$sanitized_title = $tab_title ? preg_replace("/[\”\"\’\']*|(?:’|”)*\]/i", "", preg_replace("/\[tab *title=[\”\"\’\']*|(?:’|”)*/i", "", $tab_title[0])) : __("Open Tab");

This returns "Emergency Contact important=true", which isn't what I need. I'm basically trying to get something like $title = "Emergency Contact" and $important = "true" .

How can I modify my regex string to do this? I really don't know what I'm doing with regex, surprised I've gotten as far as I have.

One additional thing to note, not every shortcode will have both values. Some alternate examples:

[tab]
[tab title="Emergency Contact"]
[tab important="true"]

Answer 1

Are you looking for something like:

<?php

$string = 'some gibberish here [tab title="Emergency Contact" important="true"] some additional info here';

$regex = '~
            (?:\[tab\s         # looks for [tab + whitespace literally
            |                  # or
            (?!\A)\G\s)        # (?!\A) = negative lookahead
                               # to make sure the following is not the start
                               # of the string
                               # \G matches at the end of the previous match
            (?P<key>\w+)       # match a word character greedily to group "key"
            =
            "(?P<value>[^"]+)" # " + anything not " + ", save this to group "value"
         ~x';                  # verbose modifier
preg_match_all($regex, $string, $matches, PREG_SET_ORDER);
foreach ($matches as $match)
    echo "Key: {$match['key']}, Value: {$match['value']}\n";
/* output:
Key: title, Value: Emergency Contact
Key: important, Value: true
*/
?>

This will look for all key/value pairs in the [tab] tag, see a demo on regex101.com .
An additional demo can be found on ideone.com .

Answer 2

I'm basically trying to get something like $title = "Emergency Contact" and $important = "true".

Try [az]+="[A-Za-z ]+" .

This is the simplest regex which will match pattern of following format.

Characters from az="Characters from AZ and az including space"

Regex101 Demo

Answer 3

You can get the shortcode attributes with using "preg_match_all".

<?php
//string
$qoute_string = '[tab title="Emergency Contact" important="true"]';

//pattern
$pattern = '/ (.*?)="(.*?)"/';

$tab_attr = array();
//get the attributes.
if(preg_match_all($pattern, $qoute_string, $data)) {
    foreach ($data[0] as $key => $val) {
        $variable = explode("=",$val);
        $tab_attr[trim($variable[0])] = str_replace('"', "", $variable[1]);
    }
}

//see the results
print_r($tab_attr);
echo '<br />';

//title
echo $tab_attr['title'];
echo '<br />';

//important
echo $tab_attr['important'];
?>