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Description

Several examples of "?" quantifier

Source

--XX-@-XX-@@-XX-@@@-XX-@@@@-XX-@@-@@-

Case 1

Regular Expression: -X?XX?X
First match:--XX-@-XX-@@-XX-@@@-XX-@@@@-XX-@@-@@-
All matches:--XX-@-XX-@@-XX-@@@-XX-@@@@-XX-@@-@@-

Case 2

Regular Expression: -@?@?@?-
First match:--XX-@-XX-@@-XX-@@@-XX-@@@@-XX-@@-@@-
All matches:--XX-@-XX-@@-XX-@@@-XX-@@@@-XX-@@-@@-

Case 3

Regular Expression: [^@]@?@
First match:--XX-@-XX-@@-XX-@@@-XX-@@@@-XX-@@-@@-
All matches:--XX-@-XX-@@-XX-@@@-XX-@@@@-XX-@@-@@-