如何用PHP替换同一行或不同行的多个字符串？

Question

Need regex to replace all inside brackets with myReplace !important need keep spaces and lines as is!

$fileContent = <div class="panel-body">
    {toChangeOne}{toChangeTwo}
                            {  
                    toChangeTree
                    }
</div>

$change = preg_replace('NEEDED_REGEX', 'myReplace', $fileContent);

Answer 1

Okay, so basically all you'd need to do is look for a set of curly braces and replace that, plus everything inside of it.

Something like this should work for you:

<?php

$fileContent = '<div class="panel-body">
    {toChangeOne}{toChangeTwo}
                            {  
                    toChangeTree
                    }
</div>';

$fileContent = preg_replace('~\{.*?\}~sm', 'myReplace', $fileContent);

print $fileContent;    

Here's what that expression means \\{.*?\\} :

• \\{ - Looking for an opening curly brace { . We need to escape it with a backslash \\ since curly braces have special meaning in regex.
• .*? - Match any character . , any number of times * until we hit the next part of our statement ? .
• \\} - The next part of our statement is a closing curly brace } . Again, we need to escape it with a backslash \\ .

Here is a working demo:

http://ideone.com/Pi8OvI

Answer 2

You could also approach your problem using an array of keys to change as below. This might be helpful when trying to replace multiple strings.

<?php

// array with keys that you'll be changing in your text
$toChange = array(
"{toChangeOne}" => "First Change",
"{toChangeTwo}" => "Second Change",
"{toChangeThree}" => "Third Change"
);


$fileContent = '<div class="panel-body">
    {toChangeOne}{toChangeTwo}
                            { 
                    toChangeThree
                    }
</div>';

// loop through all the keys you want to change
foreach($toChange as $key => $value){

    // prep regex
    // remove the openning and curly braces this 
    // way we can match anything that matches our 
    // keys even if there's a mixture of returns 
    // or empty spaces within the curly braces 
    $key_text = str_replace("{", "", $key);
    $key_text = str_replace("}", "", $key_text);

    // "\{"             - matches the character "{" literally
    // "(\s|\s+)?"      - matches any white space. In our case 
    //                    we might want it to be optional hense 
    //                    the "?"
    // "\}"             - matches the character "}" literally   
    $regex = '/\{(\s|\s+)?'.$key_text.'(\s|\s+)?\}/';

    $fileContent = preg_replace($regex, $value, $fileContent);
}

echo $fileContent;