Help with matching numbers 0-100

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Hi.

I need help with matching a variable. The variable would be e.g. 0-15
, 16-30 etc. and when the variable is equal to a certain range, it
would echo an image.

Does anyone know what function I should use? preg_match?

The code would be something like

if(preg_match("[16-30]",$variable))
{
echo "image";
}

but the above code doesn't work. How do I fix it?

Thanx

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