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php

--TEST--
Test preg_match() function : basic functionality 
--FILE--
<?php
/* Prototype  : proto int preg_match(string pattern, string subject [, array subpatterns [, int flags [, int offset]]])
 * Description: Perform a Perl-style regular expression match 
 * Source code: ext/pcre/php_pcre.c
 * Alias to functions: 
*/


$string = 'Hello, world. [*], this is \ a string';

var_dump(preg_match('/^[hH]ello,\s/', $string, $match1));							//finds "Hello, "
var_dump($match1);

var_dump(preg_match('/l^o,\s\w{5}/', $string, $match2, PREG_OFFSET_CAPTURE));				// tries to find "lo, world" at start of string
var_dump($match2);

var_dump(preg_match('/\[\*\],\s(.*)/', $string, $match3));							//finds "[*], this is \ a string";
var_dump($match3);

var_dump(preg_match('@\w{4}\s\w{2}\s\\\(?:\s.*)@', $string, $match4, PREG_OFFSET_CAPTURE, 14));	//finds "this is \ a string" (with non-capturing parentheses)
var_dump($match4);

var_dump(preg_match('/hello world/', $string, $match5));							//tries to find "hello world" (should be Hello, world)
var_dump($match5);
?>

--EXPECTF--

int(1)
array(1) {
  [0]=>
  string(7) "Hello, "
}
int(0)
array(0) {
}
int(1)
array(2) {
  [0]=>
  string(23) "[*], this is \ a string"
  [1]=>
  string(18) "this is \ a string"
}
int(1)
array(1) {
  [0]=>
  array(2) {
    [0]=>
    string(18) "this is \ a string"
    [1]=>
    int(19)
  }
}
int(0)
array(0) {
}