getallen uit een string halen

$reg_ex = "[0-9]x\^2+[+|-]+[0-9]x+[+|-]+[0-9]";

$reg_ex = "[0-9]x\^2+[+|-]+[0-9]x+[+|-]+[0-9]";

$a = 1; // Verandert
$b = 2; // Verandert
$bt = '+';
$c = -3; // Verandert
$ct = '+';
if($b < 0) $bt = '';
if($c < 0) $ct = '';

$formule = $a . 'x^2' . $bt . $b .'x' . $ct . $c;

$a = 1; // Verandert
$b = 2; // Verandert
$bt = '+';
$c = -3; // Verandert
$ct = '+';
if($b < 0) $bt = '';
if($c < 0) $ct = '';
 
$formule = $a . 'x^2' . $bt . $b .'x' . $ct . $c;

<?php
$sTest = '{([0-9]+)x\^([0-9]+)\+([0-9]+)x([0-9\-]+)}';
$sInput = '1x^2+2x-3';

$aOut = preg_match($sTest, $sInput, $aMatch);

echo '<pre>'.print_r($aMatch, 1).'</pre>';
?>

<?php
$sTest = '{([0-9]+)x\^([0-9]+)\+([0-9]+)x([0-9\-]+)}';
$sInput = '1x^2+2x-3';
 
$aOut = preg_match($sTest, $sInput, $aMatch);
 
echo '<pre>'.print_r($aMatch, 1).'</pre>';
?>