Use of capture groups in String.split() [duplicate]

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In your second result, a is appearing because you’ve wrapped it in a capture group () (parentheses).

If you want to not include it but you still require a conditional group, use a non-capturing group: (?:a). The questionmark-colon can be used inside any capture group and it will be omitted from the resulting list of captures.

Here’s a simple example of this in action: http://regex101.com/r/yM1vM4

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