首先在Java中找到String

Question

is ist possible to tell String.split("(") function that it has to split only by the first found string "("?

Example:

String test = "A*B(A+B)+A*(A+B)";
test.split("(") should result to ["A*B" ,"A+B)+A*(A+B)"]
test.split(")") should result to ["A*B(A+B" ,"+A*(A+B)"]

Answer 1

Yes, absolutely:

test.split("\\(", 2);

As the documentation for String.split(String,int) explains:

The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array. If the limit n is greater than zero then the pattern will be applied at most n - 1 times, the array's length will be no greater than n , and the array's last entry will contain all input beyond the last matched delimiter.

Answer 2

test.split("\\(",2);

See javadoc for more info

EDIT : Escaped bracket, as per @Pedro's comment below.

Answer 3

Try with this solution, it's generic, faster and simpler than using a regular expression:

public static String[] splitOnFirst(String str, char c) {
    int idx = str.indexOf(c);
    String head = str.substring(0, idx);
    String tail = str.substring(idx + 1);
    return new String[] { head, tail} ;
}

Test it like this:

String test = "A*B(A+B)+A*(A+B)";
System.out.println(Arrays.toString(splitOnFirst(test, '(')));
System.out.println(Arrays.toString(splitOnFirst(test, ')')));