note 102501 deleted from reference.pcre.pattern.modifiers by danbrown

Note Submitter: chenliq at gmail dot com 

----

Single quotes, double quotes, backslashes (\) and NULL chars will be escaped by backslashes in substituted backreferences. 
<?php
$test['test'] = 'test string to replace...';
$str = "{\$test['test']}";
$reg = '~{(\$[a-z_][\w_]*' 
  .'(?:\[[\S]+?\])*'  
  .")}~e";
$replace = '\\1';
$str = preg_replace($reg, $replace, $str);
echo $str;
?>
Fatal error:  preg_replace() [<a href='function.preg-replace'>function.preg-replace</a>]: Failed evaluating code: 
$test[\'test\'] 

<?php
$test['test'] = 'test string to replace...';
$str = "{\$test['test']}";
$reg = '~{(\$[a-z_][\w_]*' 
  .'(?:\[[\S]+?\])*'  
  .")}~e";
$replace = 'eval(\'return \\1;\')';
$str = preg_replace($reg, $replace, $str);
echo $str;
?>
output: test string to replace...