How to get (in PHP) all substrings, which describes a regular expression?

I'm creating regular expression in the form: A | B | C ... automatically, by program, where A, B, C, ... are constant strings.

I need t开发者_如何学运维o find all the matches that correspond to these regular expression, even if the A, B, C, ... have not empty intersection, or someone is substring of other.

Example:

preg_match_all ('/Hello World|Hello|World lo/i', 'xxxHello worldxxx', $m, PREG_OFFSET_CAPTURE | PREG_SET_ORDER); 
var_export ($m);

It gives:

array (
   0 =>
   array (
     0 =>
     array (
       0 => 'Hello World'
       1 => 3, // start of match
     )
   )
)

I would need:

array (
   0 =>
   array (
     0 =>
     array (
       0 => 'Hello World'
       1 => 3, // start of match
     )
     1 =>
     array (
       0 => 'Hello'
       1 => 3, // start of match
     )
     2 =>
     array (
       0 => 'lo world'
       1 => 6, // start of match
     )
   )
)

Is there any way to get it?

Thanks

---

Run a preg_match_all for each expression.

---

I would use strpos:

$str = 'xxxHello worldxxx';
$arr = array('Hello World', 'Hello', 'World');
foreach($arr as $word) {
    $pos = strpos(strtolower($str), strtolower($word));
    echo "$word found at char $pos\n";
}

output:

Hello World found at char 3
Hello found at char 3
World found at char 9