How to understand the output of the PHP regex matching below?

Posted by smarty on Stack Overflow See other posts from Stack Overflow or by smarty
Published on 2010-12-29T07:24:08Z Indexed on 2010/12/29 7:53 UTC
Read the original article Hit count: 169

Filed under:

php

|

regex

|

pattern-matching

$file = '{include file="{$COMMON_TPL_PATH}common/header_admin.tpl"}
{include file="{$mainPage}"}
{include file="{$COMMON_TPL_PATH}common/footer_admin.tpl"}';
preg_match('/^(\{\})|^(\{\*([\S\s]*?)\*\})|^(<\?(?:php\w+|=|[a-zA-Z]+)?)|^([     ]*[
]+[  ]*)|^(\{strip\})|^(\{\/strip\})|^(\{literal\})|^(\{\s{1,}\/)|^(\{\s{1,})|^(\{\/)|^(\{)|^(([\S\s]*?)(?=([    ]*[
]+[  ]*|\{|<\?)))|^([\S\s]+)/', $file, $matches);
var_dump($matches);

Why the output is:

array(13) {
  [0]=>
  string(1) "{"
  [1]=>
  string(0) ""
  [2]=>
  string(0) ""
  [3]=>
  string(0) ""
  [4]=>
  string(0) ""
  [5]=>
  string(0) ""
  [6]=>
  string(0) ""
  [7]=>
  string(0) ""
  [8]=>
  string(0) ""
  [9]=>
  string(0) ""
  [10]=>
  string(0) ""
  [11]=>
  string(0) ""
  [12]=>
  string(1) "{"
}

It seems to me that ^([\S\s]+) can match the whole string..

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