java regex to split a string by certain characters

Asked Sep 28 '16 at 16:03

Active Sep 28 '16 at 16:03

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I want to split a string by WHITE_SPACE, LPAREN or RPAREN.

I've tried this:

String st = "( a * b - (c * d )";
String[] subs = split.("(\\s+|\\(|\\))");

This kind of works, but it gives me empty strings in subs.

I expected to get "a", "*", "-", "c", "*", "d". But I actually got "", "", "a", "*", "-", "c", "*", "d". (basically, a bunch of extra empty strings)

What did I do wrong?

asked Sep 28 '16 at 16:03

One Two Three

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Nothing wrong, since you have `(` and a space at the start, you're getting empty tokens. – anubhava Sep 28 '16 at 16:05
How do I eliminate the empty tokens? – One Two Three Sep 28 '16 at 16:06
`subs = st.replaceFirst("^[()\\s]+", "").split("[()\\s]+");` – anubhava Sep 28 '16 at 16:08

java regex to split a string by certain characters

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