Making regular expressions bold

I have some coordinates on my site that are printed as:


I would like to have this (including the z) printed in bold. The coordinates are in a text string like so:

$string = 'Lorem ipsum z:000 dolor sit amet';

I think I have to do this with Regex, but I'm not getting it to work. The first part is fixed, so the parts of the regex are ^z: and [0-9]


This should help

preg_replace("/(z:[0-9]{3})/", '<b>${1}</b>', $string);

Works for z:000 to z:999

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