John Davidson

Message:

I am investigating, but I am not able to find the solution to this.

The idea is to replace the characters $_ from a string with something else.
If you remove the dollar sign from the $search variable, it kind of works (but not in a desirable way).

It is not working because the dollar sign is a special character, but I cannot find how to scape it.

This is what I have:

$search = '$_'; // replace to '_' OR '[$_]' it returs "$1" instead of "1"

$replace = 1;

$regex = '#".*?"(*SKIP)(*FAIL)|\b' . $search . '\b#s';



$fullInput = '"$_" $_';



$r = preg_replace([$regex], $replace, $fullInput);



echo $r . PHP_EOL;



// Output with current code : "$_" $_

// Output with '_' or '[$_]': "$_" $1

//

// Expected result: "$_" 1 

To have into account, if the text is between quotes, it should not be replaced.

---

My Answer:
null
$replace = '_';
$string = 'This is a $_ test string';

$new_string = preg_replace('/' . preg_quote($search, '/') . '/', $replace, $string);

echo $new_string; // Output: This is a _ test string