如何在不考虑空格的情况下拆分字符串？

Question

I am trying to split this String: "send#hi how are you" into

1. send
2. hi how are you

and then split "hi how are you" into

1. hi
2. how
3. are
4. you

My attempt:

text[0] = "send#hi how are you";
String[] one = text[0].split("#");
String[] two = text[0].split("#")[1].split("\\s#");

When splitting "send#hi how are you" , it only gives me "send" and "hi"...

How can I change my code so it works?

Answer 1

Here's code that should work, assuming that you don't want the word before the pound symbol:

String x = "send#hi how are you";
x = x.substring(x.indexOf("#")+1, x.length());
String[] splitUp = x.split(" ");

If you do want both what's before and what's after the pound:

String x = "send#hi how are you";
String before = x.substring(0, x.charAt("#"));
String after = x.substring(x.charAt("#")+1, x.length());
String[] splitUp = after.split(" ");

And here's another way to do the second:

String x = "send#hi how are you";
String[] pieces = x.split("#");
//at this point pieces[0] will be the word before the pound and pieces[1] what is after
String[] after = pieces[1].split(" ");

A final note - splitting on " " is one way to do it, but splitting on "\\\\s" is basically the same thing using regex, which may be more reliable.

Answer 2

Your problem is that the text being split on (in this case "#" ) is consumed by the split - ie it's not retained in any of the resulting strings.

The smallest edit to get you going is to change:

String[] two = text[0].split("#")[1].split("\\s#");

to:

String[] two = text[0].split("#")[1].split("\\s");
//                                             ^--- remove the #

Answer 3

I would do it in this way:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

String str = "send#hi how are you";
Pattern p = Pattern.compile("([^#]+)#(.*)");
Matcher m = p.matcher(str);

if (m.find()) {
  String first = m.group(1);
  String[] second = m.group(2).split("\\s+");

  System.out.println(first);
  System.out.println(java.util.Arrays.asList(second));
}

or if you want the simplest way:

String str = "send#hi how are you";

String[] parts = str.split("#", 2);
String first = parts[0];
String[] second = parts[1].split("\\s+");

System.out.println(first);
System.out.println(Arrays.asList(second));