How to make a regular expression case insensitive?
The case insensitive usually is adding a "i" char after the delimiter bar, something like this:
/^AB37|^AB38|^AB41/i

but depends of the case it can be changed. In JS, for example is adding a new param (var re = new RegExp(myVar,"ig")) or in php is preg_match("[expression]i", $text, $matches);