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dart how to split string by regex like this?

How to split:

String a = 'abc,Hello, 123,world';
a.split(RegExp(',[a-zA-Z]'));

as the following:

abc  
Hello, 123
world

But the code above will produce:

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abc
ello, 123
orld

>Solution :

Use a lookahead:

,(?=[a-zA-Z])
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