按空格而不是包含空格的双引号（“）分隔Java String

Question

I want split a phrase on spaces, and not spaces within a quoted string (ie, a string within pair of double quotation marks " ).

For example:

software term "on the fly" and "synchrony"

Should be split into these 5 segments:

software  
term   
on the fly  
and  
synchrony

So how could I implement this in java?

Answer 1

This regex achieves the split for you, and cleans up any delimiting quotes:

String[] terms = input.split("\"?( |$)(?=(([^\"]*\"){2})*[^\"]*$)\"?");

It works by splitting on a space, but only if it is followed by an even number of quotes.
The quotes themselves are consumed, so they don't end up in the output, by including them optionally in the split term.
The term ( |$) was needed to capture the trailing quote.

Note that if the first term could be quoted, you'll need to clean up that leading quote first:

String[] terms = input.replaceAll("^\"", "").split("\"?( |$)(?=(([^\"]*\"){2})*[^\"]*$)\"?");

---

Test code:

String input = "software term \"on the fly\" and \"synchron\"";
String[] terms = input.split("\"?( |$)(?=(([^\"]*\"){2})*[^\"]*$)\"?");
System.out.println(Arrays.toString(terms));

Output:

[software, term, on the fly, and, synchron]

Answer 2

    String str = "software term \"on the fly\" and \"synchron\"";
    String[] arr = str.split("\""); // split on quote first
    List<String> res = new LinkedList<>();
    for(int i=0; i<arr.length; i++) {
        arr[i] = arr[i].trim();
        if ("".equals(arr[i])) {
            continue;
        }
        if (i % 2 == 0) {
            String[] tmp = arr[i].split("\\s+"); // second, split on spaces (when needed)
            for (String t : tmp) {
                res.add(t);
            }
        } else {
            res.add("\"" + arr[i] + "\""); // return the quote back to place
        }

    }
    System.out.println(res.toString());

OUTPUT

[software, term, "on the fly", and, "synchron"]

Answer 3

alternative to the previous post:

    boolean quoted = false;
    for(String q : str.split("\"")) {
        if(quoted)
            System.out.println(q.trim());
        else
            for(String s : q.split(" "))
                if(!s.trim().isEmpty())
                    System.out.println(s.trim());
        quoted = !quoted;
    }