$input_text = 'The!quick@brown#fox$jumps%^over*_the+\\lazy=dog.';
$pattern = "/[!@#$%^*_+=\\\\]/";
$replacement = " ";
// Perform regex replacement
$result = preg_replace($pattern, $replacement, $input_text);
echo "Original: " . $input_text . "\n";
echo "Modified: " . $result . "\n";
/*
run:
Original: The!quick@brown#fox$jumps%^over*_the+\lazy=dog.
Modified: The quick brown fox jumps over the lazy dog.
*/