PHP REGEX preg_replace_callback not matching

Question

I am trying to match

[history="e70b3ffc-beaf-423f-b084-72bc5bae3147"]History name here[/history]

and get the ID and the content between the "tags". And although the above works fine at https://regexr.com/3ilt2 it's won't match on my code and I cannot figure out why. Any ideas?

    $parsed_string = preg_replace_callback(
        // [history="ID"]ABC[/history]
        '/\[history="(.*?)"\](.*?)\[\/history\]/', 
        function ($matches) {
            return $this->parseHistories( $matches, 'alt-name' );
        }, 
        $parsed_string
    );

Your code is fine, except for parseHistories which I'm assuming is doing something wrong. Maybe show us that missing code. — Tim Biegeleisen
– Tim Biegeleisen, Commented Jan 2, 2018 at 8:29

Tim Biegeleisen · Accepted Answer · 2018-01-02 08:27:31Z

1

The preg_replace_callback function works fine in the following code:

$parsed_string = "[history=\"e70b3ffc-beaf-423f-b084-72bc5bae3147\"]History name here[/history]";
$parsed_string = preg_replace_callback(
    // [history="ID"]ABC[/history]
    '/\[history="(.*?)"\](.*?)\[\/history\]/', 
    function ($matches) {
        return $matches[1];    // return the first capture group (the UUID)
    }, 
    $parsed_string
);
echo $parsed_string;

This outputs the captured UUID e70b3ffc-beaf-423f-b084-72bc5bae3147. There must be a problem with your parseHistories() function.

Demo

answered Jan 2, 2018 at 8:27

Tim Biegeleisen

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8 Comments

Dimitris Romeo Havlidis Over a year ago

You have added a \ after the [history= which was not there originally and after the UUID the string I am trying to pass shouldn't have it. are you escaping- I am a bit confused. I can see that the above is working but I cannot understand

Tim Biegeleisen Over a year ago

@DimitrisRomeoHavlidis I just cut and paste your pattern, that's all.

revo Over a year ago

He's talking about subject string. Yes @DimitrisRomeoHavlidis, it's escaping.

Tim Biegeleisen Over a year ago

@Revo I'm surprised that his code would even run without escaping a double quote inside a double quoted string.

revo Over a year ago

I know what you are trying to say, he just doesn't know it.

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