[Complicated preg_replace (php) for template tag parsing]

I am writing a template parsing engine and I came across the need to parse some very complicated tags.  Here is an example:

 

Input:

Before{{{test}}}After
{{{array[1]}}}
{{{object->bandana('banana')}}}

 

Output (If it worked):

Before<?php echo TemplateVars::getVar("test"); ?>After
<?php echo TemplateVars::getVar("array")[1]; ?>
<?php echo TemplateVars::getVar("object")->bandana('banana'); ?>

 

The php code I am using to parse this is:

$regex = '/[{]{3}([\w]+)([\-\[=>\W]*)([\w\(\'"]*)([\]\)]*)[}]{3}/U';
preg_replace($regex,'<?php echo TemplateVars::getVar("$1")$2$3$4; ?>',$data);

 

Unfortunately that outputs the following:

Before<?php echo TemplateVars::getVar("t")est; ?>After
<?php echo TemplateVars::getVar("array")[1]; ?>
<?php echo TemplateVars::getVar("object")->bandana('banana'); ?>

 

 

I have also tried stuff like:

$regex = '/[{]{3}([\w]+)([^}.]*)[}]{3}/U';

 

But that gives every tag the same results as {{{test}}}.

 

Any help is appreciated. Also if I need to elaborate more just ask.

[Simple Question... I think [Solved]]

Thank you for all the help. It works great. :)

[Simple Question... I think [Solved]]

Everything still validates.  ???

Code:
[code]$test = array("Test","Test_11","Test.11","TEST","test","()Test");
echo "Test2 <br>";
foreach ($test  as $var){
echo $var." - ";
if(!ereg("[A-Za-z0-9_-]+",$var)) echo "Doesn't validate";
else  echo "Does validate";
echo "<br>";
}[/code]

Output:
[code]Test2
Test - Does validate
Test_11 - Does validate
Test.11 - Does validate
TEST - Does validate
test - Does validate
()Test - Does validate[/code]

[Simple Question... I think [Solved]]

Is there a chance that I have php configured wrong? I just tested what you said and it didn't work.

[code]$test = array("Test","Test_11","Test.11","TEST","test","()Test");

foreach ($test  as $var){
echo $var." - ";
if(!ereg("[A-Za-z0-9_-]*",$var)) echo "Doesn't validate";
else  echo "Does validate";
echo "<br>";
}[/code]

This was the output:
[code]Test - Does validate
Test_11 - Does validate
Test.11 - Does validate
TEST - Does validate
test - Does validate
()Test - Does validate[/code]

The third and last one shouldn't validate.

[Simple Question... I think [Solved]]

I'm pretty new to PHP and I was wondering how I can verify that the data that was submited via POST from a form that it only contains letters, numbers, or the underscore charater.  I've tried a few things but sofar I haven't had any luck.