CODEWITHSUNDEEP
phpregexpreg-replace
user4860986
user4860986

Reputation:

How to replace unmatched words with special character?

I want to replace equal number of unmatched characters with *. Like as I've string 

[email protected]

should be replace into

x*********s@x**s.com

Right now just for work around I'm using the following regex

^(\w).*?(.@.).*?(.\.\w+)

So using that followed regex along with preg_replace like as

echo preg_replace('/^(\w).*?(.@).*?(\.\w+)/', "$1****$2****$3", "[email protected]");

which result into

x****s@x****s.com

but what I want to achieve over here is 

x*********s@x**s.com

Demo

Upvotes: 2

Views: 232

Answers (4)

Amessihel
Amessihel

Reputation: 6394

Another try, without explode :

<?php

$email="[email protected]" ;

$arobase_pos = strpos($email,"@"); // first occurence of "@"
$dot_pos = strrpos($email,".");    // last occurence of ".""

// from 2 to post(@) -1
$email = substr_replace($email, str_repeat ("*", $arobase_pos - 2), 1, $arobase_pos - 2);
// from pos(@)+2 to pos(.)-1 
$email = substr_replace($email, str_repeat ("*", $dot_pos-1-$arobase_pos-2),  $arobase_pos + 2, $dot_pos-1-$arobase_pos-2);

// Display
echo $email;
?>

Upvotes: 0

Arsen
Arsen

Reputation: 10951

Also you can use preg_replace_callback function

function callbackFunction($m) {
  return $m[1].(str_repeat('*', strlen($m[2]))).$m[3].(str_repeat('*', strlen($m[4]))).$m[5];
}

$pattern = '|^(\\w)(.*?)(.@.)(.*?)(.\\.\\w+)|';
$subject = '[email protected]';
print_r( preg_replace_callback($pattern, 'callbackFunction', $subject, -1 ) );

Upvotes: 0

Avinash Raj
Avinash Raj

Reputation: 174706

I would use (*SKIP)(*F)

preg_replace('~(?:^.|.@.|.\.\w+$)(*SKIP)(*F)|.~', '*', $str);

DEMO

  • First match all the chars you don't want. ie, (?:^.|.@.|.\.\w+$)
  • Now, skip those matches using (*SKIP)(*F)
  • | OR
  • Now the dot after | will match all the characters other than the skipped ones.

Upvotes: 3

Vincent Decaux
Vincent Decaux

Reputation: 10714

Not using preg_replace, just to give you an idea, my code is not optimized ! (I know)

$str = '[email protected]';
$buff = explode('@', $str);
$buff2 = explode('.', $buff[1]);

$part1 = $buff[0][0] . str_repeat('*', strlen($buff[0]) - 2) . $buff[0][strlen($buff[0]) - 1];
$part2 = $buff[1][0] . str_repeat('*', strlen($buff2[0]) - 2) . $buff2[0][strlen($buff2[0]) - 1];

echo $part1 .'@'. $part2 .'.'. $buff2[1];

But it works.

Upvotes: 0

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