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Need a regular expression for preg_match

Using PHP I want to search through a string and build an array of results of text that is between {% and %}

For example, I have a string that's a template of a page and will contain things like {%mainBody%} and {%header%}

I want to be able to run through the string and return to an array things like just mainBody and header.

I have no prior experience with regular expressions and although I've searched google I'm having no look finding what I need.
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AlivewithTechnology
Asked:
AlivewithTechnology
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1 Solution
 
kebabsCommented:
Crude but it works. Replace $array and $html with your variable names.
preg_match('/{%([^%]+)%}/e', '$array[\'\\1\']', $html);

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kebabsCommented:
That's supposed to be preg_replace... sorry.
preg_replace('/{%([^%]+)%}/e', '$array[\'\\1\']', $html);

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Richard QuadlingSenior Software DeverloperCommented:
The attached script outputs ...

array(1) {
  [0]=>
  array(3) {
    [0]=>
    string(9) "{% and %}"
    [1]=>
    string(12) "{%mainBody%}"
    [2]=>
    string(10) "{%header%}"
  }
}
preg_match_all
	(
	'`{%(?!.%}).*?%}`sim',
	file_get_contents('http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/PHP_Databases/Q_23005845.html?cid=295'),
	$a_Matches
	);
var_dump($a_Matches);
?>

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Richard QuadlingSenior Software DeverloperCommented:
If there are only supposed to be letters (no numbers, spaces, etc), then the new output is ...

array(1) {
  [0]=>
  array(4) {
    [0]=>
    string(12) "{%mainBody%}"
    [1]=>
    string(10) "{%header%}"
    [2]=>
    string(12) "{%mainBody%}"
    [3]=>
    string(10) "{%header%}"
  }
}

As I'm looking at THIS page as my source, every time I add a {%xxxx%} it will be found by the code, so really, just rely on the regex.
<?php
preg_match_all
	(
	'`{%(?!.%})[a-z]*?%}`sim',
	file_get_contents('http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/PHP_Databases/Q_23005845.html?cid=295'),
	$a_Matches
	);
var_dump($a_Matches);
?>

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kebabsCommented:
That's right isn't it?

And use the preg_replace to make the changes:

e.g. {%mainBody%} -> $array['mainBody']
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Richard QuadlingSenior Software DeverloperCommented:
No.

"Using PHP I want to search through a string and build an array of results of text that is between {% and %}"

"Search" and "build an array of results".

That's preg_match_all()'s territory.

preg_match will only find the first entry.

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Richard QuadlingSenior Software DeverloperCommented:
Oops. Just reread the q.

Outputs ...

array(3) {
  [0]=>
  string(8) "mainBody"
  [1]=>
  string(6) "header"
  [8]=>
  string(4) "xxxx"
}


<?php
preg_match_all
	(
	'`{%(?!.%})([a-z]*?)%}`sim',
	file_get_contents('http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/PHP_Databases/Q_23005845.html?cid=295'),
	$a_Matches,
	PREG_PATTERN_ORDER
	);
$a_Results = array_unique($a_Matches[1]);
var_dump($a_Results);
?>

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kebabsCommented:
Then what is wrong with the output in your 2 posts before?

You can parenthesise the  [a-z]*? part to isolate the text between in the results if you want.
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Richard QuadlingSenior Software DeverloperCommented:
So, $a_Results now contains the tags that exist in the template.

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kebabsCommented:
Ignore that last post, we posted about the same time ;)
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Richard QuadlingSenior Software DeverloperCommented:
kebabs, yeah, I missed that, but my fix came in just before your comment on the lack of capturing  ().

Oops! Hey. I'm only an expert, not god!
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kebabsCommented:
Yes (referring to post about $a_Results)
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kebabsCommented:
Ok, so all sorted now?
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kebabsCommented:
Umm... RQuadling, I was replying to you as if you were the one who asked the question. Sorry for any confusion!
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Richard QuadlingSenior Software DeverloperCommented:
Yep!

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Richard QuadlingSenior Software DeverloperCommented:
What? My answer looks like I'm a newbie? Gee! So much for my ZCE then!
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AlivewithTechnologyAuthor Commented:
so far this code is the closest to what I'm looking for, but it includes the brackets etc, however I can remove them using str_replace if needs be.
I tried RQuadlings solution to remove the brackets but it only seemed to return one result.

Here is what's returned when I run the code below;


Array
(
    [0] => Array
        (
            [0] => {%metaTitle%}
            [1] => {%1mainBody%}
            [2] => {%2newsBody%}
            [3] => {%3footer%}
        )

)

<?php
$filename="templates/template.tpl"; 
$output=""; 
$file = fopen($filename, "r"); 
while(!feof($file)) { 
 
    //read file line by line into variable 
  $output = $output . fgets($file, 4096); 
  
} 
fclose ($file); 
 
preg_match_all('`{%(?!.%}).*?%}`sim',$output,$a_Matches);
 
echo "<pre>";
print_r($a_Matches);
echo "</pre>";
?>

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ddrudikCommented:
<?php
$string = <<<EOF
For example, I have a string that's a template of a page and will contain things like {%mainBody%} and {%header%}

I want to be able to run through the string and return to an array things like just mainBody and header.
EOF;
$pattern = '/(?<=\{%)[^%]*(?=%\})/';
preg_match_all($pattern, $string, $array);
echo '<pre>', print_r($array, true), '</pre>';
?>
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Richard QuadlingSenior Software DeverloperCommented:
Did you not see this ...

Output is only the tags. No {% %}

array(4) {
  [0]=>
  string(8) "mainBody"
  [1]=>
  string(6) "header"
  [8]=>
  string(4) "xxxx"
  [10]=>
  string(9) "metaTitle"
}

Based upon the current content of THIS page.
<?php
preg_match_all
        (
        '`{%(?!.%})([a-z]*?)%}`sim',
        file_get_contents('http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/PHP_Databases/Q_23005845.html?cid=295'),
        $a_Matches,
        PREG_PATTERN_ORDER
        );
$a_Results = array_unique($a_Matches[1]);
var_dump($a_Results);
?>

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Richard QuadlingSenior Software DeverloperCommented:
You need to always read through all the comments.

kebabs and I went back and forth a bit on this one.
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Richard QuadlingSenior Software DeverloperCommented:
Running ddruik's code on this page outputs ...

<pre>Array
(
    [0] => Array
        (
            [0] =>  and
            [1] => mainBody
            [2] => header
            [3] =>  and
            [4] => mainBody
            [5] => header
            [6] => (?!.
            [7] => mainBody
            [8] => header
            [9] => mainBody
            [10] => header
            [11] => xxxx
            [12] => (?!.
            [13] => mainBody
            [14] =>  and
            [15] => (?!.
            [16] => metaTitle
            [17] => 1mainBody
            [18] => 2newsBody
            [19] => 3footer
            [20] => (?!.
            [21] => mainBody
            [22] => header
            [23] =>
            [24] => (?!.
        )

)
</pre>

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ddrudikCommented:
AlivewithTechnology, thanks for the question and the points.
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Richard QuadlingSenior Software DeverloperCommented:
The answer given by ddrudik doesn't match the question. Unless I'm missing something.
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ddrudikCommented:
Actually it does, and you have shown this with the actual output from the pattern.  AlivewithTechnology wanted to match all text blocks between {% and %} which is what my pattern does.  The seemingly odd matches you received in your processing of this page is due to the various pattern constructs and examples that contain text within {% and %}.
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Richard QuadlingSenior Software DeverloperCommented:
How come then my answer matches only the text which is REALLY between {% and %}.


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Richard QuadlingSenior Software DeverloperCommented:
Ah. I used an additional filter of only letters for the tag. But it could be anything.

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