How to use preg_replace_callback() in php to replacing text pattern?

Question

0.00/5 (No votes)

See more:

hi guys,

i have string like "
 [#ff0000] RedColor
      [#0000ff]BlueColor[/#0000ff]
 [/#ff0000]"
and i want to get the HTML code like "
 <font color="#ff0000"> RedColor
      <font color="#0000ff">BlueColor</font>
 </font>"
 from that string

following php code is perfect work with only one font tag

PHP

 $text = '[#ff0000] RedColor [/#ff0000]'; // <- text to replace with only one tag
$text = preg_replace_callback('/\[(#[A-F,a-f,0-9]{6})\](.*?)\[(\/#[A-F,a-f,0-9]{6})\]/', function ($m) {
          if("/".$m[1]==$m[3])
         return '<font color="'.$m[1].'">'.$m[2].'</font>';
}, $text);  // <- this is function that return the html code
echo $text;

Out Put
RedColor

but when using nested font(pattern) unexpected result i get

PHP

 $text = '[#ff0000] RedColor
      [#0000ff]BlueColor[/#0000ff]
[/#ff0000]'; // <- text to replace with nested tags
 $text = preg_replace_callback('/\[(#[A-F,a-f,0-9]{6})\](.*?)\[(\/#[A-F,a-f,0-9]{6})\]/', function ($m) {
           if("/".$m[1]==$m[3])
          return '<font color="'.$m[1].'">'.$m[2].'</font>';
 }, $text);  // <- this is function that return the html code
 echo $text;

And i got the output like below
[/#ff0000]
instead
RedColor BlueColor

i have visited the following link : here[^] but no solution i got
thanx.

Posted 9-Jul-15 21:51pm

patelpratik

Updated 9-Jul-15 22:02pm

v3

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Prava-MFS · Answer 1 · 2015-07-21T20:35:00

Your text string is wrong in 2nd case. Please try this:

PHP

<?php
    $text = '[#ff0000] RedColor [/#ff0000] [#0000ff]BlueColor[/#0000ff]';// <- text to replace with only one tag
    $text = preg_replace_callback('/\[(#[A-F,a-f,0-9]{6})\](.*?)\[(\/#[A-F,a-f,0-9]{6})\]/', function ($m) {
    if("/".$m[1] == $m[3])
        return '<font color="'.$m[1].'">'.$m[2].'</font>';
}, $text);  // <- this is function that return the html code
    echo $text;
?>

Your text string should be like this :

$text = '[#ff0000] RedColor [/#ff0000] [#0000ff]BlueColor[/#0000ff]';

Tag for RedColor should be closed before starting of BlueColor. Hope it helps :)