正则表达式匹配特定字符集之间的整数

Question

I need to replace all integers after and before these specific characters: ( ) * - / % + space but nothing than these.

So (34 + should match but a34 + or k3- should not.

I have this so far, '/(?:-| |\\(|\\)|\\+|\\*|\\/|%)(\\d+)(?:-| |\\(|\\)|\\+|\\*|\\/|%)/' but this is not working like what I want it to.

$pattern = '/[- ()+*\/%](\d+)[- ()+*\/%]/';
$replacement = "xyz($1)";
$insideFunc = preg_replace($pattern, $replacement, $insideFunc);

$insideFunc = "float y = 45*(3-max(3-float(ceil(3)), 3-float(floor(3))))*2.302585092994046"

output -> float y =xyz(45)xyz(3)maxxyz(3)float(ceilxyz(3)),xyz(3)float(floorxyz(3))))*2.302585092994046

I want it to be, float y = xyz(45)*(xyz(3)-max(xyz(3)-float(ceil(xyz(3))), xyz(3)-float(floor(xyz(3)))))*2.302585092994046

Answer 1

I changed it like that and it's working now.

$pattern = '/([- ()+*\/%])(\d+)([- ()+*\/%])/';
$replacement = "$1float($2)$3";