preg_replace 字串替換 – 柯博文老師

詳細對照表請參考
Regular Expressions　正則表達式
單一替換

$str = 'Visit Microsoft!';
$pattern = '/microsoft/i';
echo preg_replace($pattern, 'powenko', $str);

輸出：
Visit powenko!

多部分替換

$string = 'The quick brown fox jumps over the lazy dog.';
$patterns = array();
$patterns[0] = '/quick/';
$patterns[1] = '/brown/'; 
$replacements = array('bear','black'); 
echo preg_replace($patterns, $replacements, $string);

輸出：
The bear black fox jumps over the lazy dog.

日期格式替換

$patterns = array ('/(19|20)(\d{2})-(\d{1,2})-(\d{1,2})/',
                   '/^\s*{(\w+)}\s*=/');
$replace = array ('\3/\4/\1\2', '$\1 =');
echo preg_replace($patterns, $replace, '{startDate} = 1999-5-27');

輸出：
$startDate = 5/27/1999

去除空格
此示例從字符串中去除多餘的空格。

$str = 'a      b    c    d';
echo "[".$str."]<br>"; 
$str = preg_replace('/\s\s+/', ' ', $str); 
echo "[".$str."]<br>";

輸出：
[a b c d]
[a-b-c-d]

$count = 0;
echo preg_replace(array('/\d/', '/\s/'), '*', 'xp 4 to', -1 , $count);
echo "<br>"; 
echo $count; //3

輸出：
xp***to
3

數字替換

   $copy_date = "Copyright 1999";
   $copy_date = preg_replace("([0-9]+)", "2000", $copy_date);
   print $copy_date;

輸出：
Copyright 2000

小寫英文替換

 
   $copy_date = "Copyright 1999";
   $copy_date = preg_replace("([a-z]+)", "powenko", $copy_date);
   
   print $copy_date;

輸出：
Cpowenko 1999

大小寫英文替換

 

   $copy_date = "Copyright 1999";
   $copy_date = preg_replace("([A-Z,a-z]+)", "powenko", $copy_date);
   print $copy_date;

輸出：
powenko 1999

大小寫英文和數字替換

 
   $copy_date = "Copyright 1999";
   $copy_date = preg_replace("([A-Z,a-z,0-9]+)", "powenko", $copy_date);
   print $copy_date;

輸出：
powenko powenko

 
$string = 'November 01, 2018';
$pattern = '/(\w+) (\d+), (\d+)/i';
$replacement = '$3年 ${1}月 $2日';
   
echo preg_replace($pattern, $replacement, $string);

輸出：
2018年 November月 01日

 

$subject = array('1', 'GFG', '2',
'Geeks', '3', 'GCET', 'Contribute', '4'); 
$pattern = array('/\d/', '/[a-z]/', '/[1a]/'); 
$replace = array('X:$0', 'Y:$0', 'Z:$0'); 
  
// Print Result return by function
echo "preg_replace returns\n";
print_r(preg_replace($pattern, $replace, $subject));

輸出：
preg_replace returns
Array
(
[0] => X:Z:1
[1] => GFG
[2] => X:2
[3] => GY:eY:eY:kY:s
[4] => X:3
[5] => GCET
[6] => CY:oY:nY:tY:rY:iY:bY:uY:tY:e
[7] => X:4
)

 
$count = 0;
  
// Display result after replace and count 

echo preg_replace(array('/\d/', '/\s/'),
        '*', 'Geeks 4 Geeks 5', 1, $count);
echo "<br>" . $count . "<br>" ;
echo preg_replace(array('/\d/', '/\s/'),
        '*', 'Geeks 4 Geeks 6', 2, $count);
echo "<br>" . $count . "<br>" ;
        
echo preg_replace(array('/\d/', '/\s/'),
        '*', 'Geeks 4 Geeks 6', -1, $count);
echo "<br>" . $count . "<br>" ;

輸出：
Geeks** Geeks 5
2
Geeks***Geeks *
4
Geeks***Geeks**
5

找出id 並替換

 
$string ='
  <div id="myid">this has to be replaced</div>
  <p>here is something</p>
  <div id="any">any text not to be replaced</div>';

echo $string = preg_replace('/<div id=\"myid\">.*?<\/div>/','anything',$string);

輸出：
anything
here is something

any text not to be replaced

找出id 並替換 (內容有跳行)

 
$string ='
  <div id="myid">this has to be replaced</div>
  <div id="printhead"><p>ELECTRONICS 18-06-RBO-049-01	EMC TESTING DEPARTMENT　</p>
  </div>
';

echo $string = preg_replace('/<div id=\"printhead\">.*?<\/div>/s','anything',$string);

輸出：
this has to be replaced
anything

輸出：

PHP