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split( )
Splitting divides an input string into an array of String objects, delimited by the regular expression.
String[] split(CharSequence charseq)
String[] split(CharSequence charseq, int limit)
This is a quick and handy way of breaking up input text over a common boundary:
//: c12:SplitDemo.java
import java.util.regex.*;
import com.bruceeckel.simpletest.*;
import java.util.*;
public class SplitDemo {
private static Test monitor = new Test();
public static void main(String[] args) {
String input =
"This!!unusual use!!of exclamation!!points";
System.out.println(Arrays.asList(
Pattern.compile("!!").split(input)));
// Only do the first three:
System.out.println(Arrays.asList(
Pattern.compile("!!").split(input, 3)));
System.out.println(Arrays.asList(
"Aha! String has a split() built in!".split(" ")));
monitor.expect(new String[] {
"[This, unusual use, of exclamation, points]",
"[This, unusual use, of exclamation!!points]",
"[Aha!, String, has, a, split(), built, in!]"
});
}
} ///:~
The second form of split( ) limits the number of splits that occur.
Notice that regular expressions are so valuable that some operations have also been added to the String class, including split( ) (shown here), matches( ), replaceFirst( ), and replaceAll( ). These behave like their Pattern and Matcher counterparts.
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