How to implement regular string replacement in php

How to implement regular string replacement in php: first create a PHP sample file; then use the expression "preg_match_all('/(http:\/\/blog.com).*?(php)/is ',"aaaa..." Just implement string replacement.

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The operating environment of this tutorial: windows7 system, PHP5.6 version, this method is suitable for all brands of computers.

Implementation method of php regular string replacement:

The requirement is to add some strings after a specific string in a piece of content

	preg_match_all('/(http:\/\/blog.com).*?(php)/is',"aaaahttp://blog.com/sss/index.phpsdsdahttp://blog.com/dssssss/index.phpsdhttp://blog.com/dssssss/index.phpsd", $data);

	var_dump($data);die;

The key question is how to write the regular expression

///
//到时补充下有关正则
//

strpos Find the string position

$newstring = 'abcdef abcdef';
$pos = strpos($newstring, 'a', 1); // $pos = 7, 不是 0  第三个参数是标记从哪里开始找

function getCharpos2($str, $char){
       $j = 0;
       $arr = array();
       $count = substr_count($str, $char);
       for($i = 0; $i < $count; $i++){
             $j = strpos($str, $char, $j);
             $arr[] = $j;
             $j = $j+1;
       }
       return $arr;
}

str_replace 这个没什么好说的 就是替换

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