StringUtils or any library class method to preserve the delimiter [duplicate]

Question

I am having a string "role1@role2@role3@role4$arole" separated with delimiter @ and $. I used below java code

String str = "role1@role2@role3@role4$arole"; String[] values = StringUtils.splitPreserveAllTokens(str, "\\@\\$"); for (String value : values) { System.out.println(value); }

And got the result

role1 role2 role3 role4 arole

But my requirement is to preserve the delimiter in the result. So, the result has to be as per requirement

role1 @role2 @role3 @role4 $arole

I analyzed the apache commons StringUtils method to do that but was unable to found any clue.

Any library class to get the above intended results?

Wiktor Stribiżew · Accepted Answer · 2016-11-23 12:26:24Z

You may use a simple split with a positive lookahead:

String str = "role1@role2@role3@role4$arole"; String[] res = str.split("(?=[@$])"); System.out.println(Arrays.toString(res)); // => [role1, @role2, @role3, @role4, $arole]

See the Java demo

The (?=[@$]) regex matches any location in a string that is followed with a @ or $ symbol (note the $ does not have to be escaped inside a [...] character class).

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