Question

i am trying to replace string that is matched
see example bellow

<?php
    $str="this is going to bold [[this]]";
    echo preg_replace("/[[(.*)]]+/i","<b>$1</b>",$str);
?>

So the output will look like this

this is going to bold this

Edit:

<?php
    $str="bhai bhai *that* -wow- perfect";
    $find[0]="/*(.+)*/i";
    $find[1]="/-(.+)-/i";
    $rep[0]="<b>$1</b>";
    $rep[1]="<i>$1</i>";
    echo preg_replace($find,$rep,$str);
?>

This is showing warning

Warning: preg_replace() [function.preg-replace]: Compilation failed: nothing to repeat at offset 0 in C:\xampp\htdocs\page.php on line 7

Answer 1

Try this :

<?php
    $str="this is going to bold [[this]]";
    echo preg_replace("/\[\[(.+)\]\]+/i","<b>$1</b>",$str);
?>

Output :

this is going to bold this

---

Hint :

[ and ] characters are considered special, so you’ll have to escape them (like : \[, \]).

---

UPDATE :

---

<?php
    $str="bhai bhai *that* -wow- perfect";
    $find[0]="/\*(.+)\*/i";
    $find[1]="/\-(.+)\-/i";
    $rep[0]="<b>$1</b>";
    $rep[1]="<i>$1</i>";
    echo preg_replace($find,$rep,$str);
?>