C4::ClassSplitRoutine::RegEx - regex call number sorting key routine
use C4::ClassSplitRoutine;
my $cn_sort = C4::ClassSplitRoutine::RegEx::split_callnumber($cn_item, $regexs);
my $cn_split = C4::ClassSplitRoutine::RegEx::split_callnumber($cn_item, $regexs);
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