replace text with regex php, I got this error

Question

<html>
<body>
<form name='form' method='post' action="">
Dork: <input type="text" name="dork" id="dork" >
<input type="submit" name="submit" value="Submit">  
</form>
</body>
</html>
<?php 
$ptn = "/(?:[a-z]{4,5}://[a-z.0-9]*\/)?([a-z.\?_=]*)([0-9]*)/";  // Regex
$str = $_POST['dork']; //Your input, perhaps $_POST['textbox'] or whatever
$rpltxt = "$1";  // Replacement string
echo preg_replace($ptn, $rpltxt, $str);
?>

I got this error

Warning: preg_replace(): Unknown modifier '/'

How to fix it like this http://prntscr.com/ex29j2

score 0 · Answer 1 · answered Apr 16 '17 at 12:17

0

You are using unescaped slashes in the middle of your pattern: // The first slash defines the pattern end and the second gets therefore interpreted as a modifier. Escape both like:

/(?:[a-z]{4,5}:\/\/[a-z.0-9]*\/)?([a-z.\?_=]*)([0-9]*)/

answered Apr 16 '17 at 12:17

Marc Anton Dahmen

1,071
6
6

score 0 · Accepted Answer · answered Apr 16 '17 at 12:17

0

Escape the slashes:

$ptn = "/(?:[a-z]{4,5}:\/\/[a-z.0-9]*\/)?([a-z.\?_=]*)([0-9]*)/";  // Regex
//              here __^ ^

or use another delimiter

$ptn = "~(?:[a-z]{4,5}://[a-z.0-9]*/)?([a-z.?_=]*)([0-9]*)~";  // Regex

answered Apr 16 '17 at 12:17

Toto

89,455
62
89
125

how to replace with empty string – NYARUU.com Apr 16 '17 at 12:24
@NYARUU.com: just use `""` in the replacement part. – Toto Apr 16 '17 at 12:25
ok thanks, how to remove " http:// " http://prntscr.com/ex2dk8 please correction $ptn = "~(?:[a-z]{4,5}://[a-z.0-9]*/)?([a-z.?_=]*)([0-9]*)~"; // Regex – NYARUU.com Apr 16 '17 at 12:30

replace text with regex php, I got this error

2 Answers2