See the below examples and find the differences
Case 1:
perl -e 'print map {++$count," : ",$_,"\n"}split /(a|b)+/,"a12cdabab"'
1 :
2 : a
3 : 12cd
4 : b
Case 2:
perl -e 'print map {++$count," : ",$_,"\n"}split /((?:a|b)+)/,"a12cdab
+ab"'
1 :
2 : a
3 : 12cd
4 : abab
Case 3:
perl -e 'print map {++$count," : ",$_,"\n"}split /(?:a|b)+/,"a12cdabab
+"'
1 :
2 : 12cd
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