Java Substrings

Question

Basically I have these connection strings that I need to split up, heres an example of one:

name=type,info1;101;localhost;-1;false;false

I want to split it up into three variables: name, type and info.

the name is the bit before the '=' ("name") the type is the bit after the '=' and before the ',' ("type") the info is everything after the ',' ("info1;101;localhost;-1;false;false")

I have tried using the ".split" function but to no avail. Could anybody help me do it using a regular expression with substrings? Thanks.

Not had much practise with the split function, so it went like this:

String name [] = connString.split(",");
String type [] = connString.split(";");
String info [] = connString.split("");

MORE:

could you use the '.split' method to split up the parameters in this line from an XML doc?

 <rect x="298.43" width="340.00" y="131.12" height="380.00" id="rect_1" style="stroke-width: 1; stroke: rgb(0, 0, 0); fill: rgb(255, 102, 0); "/>

Can you post your split()-related code ? That should normally work. Bear in mind that split() takes a regular expression — Brian Agnew
– Brian Agnew, Commented Aug 23, 2012 at 8:27
Please post Short, Self contained and Correct Code to get proper , possibly a correct answer. — sakthisundar
– sakthisundar, Commented Aug 23, 2012 at 8:30

Peter Lawrey · Accepted Answer · 2012-08-23 08:32:30Z

6

Do you mean?

String s = "name=type,info1;101;localhost;-1;false;false";
String[] parts = s.split(",");
String[] parts2 = parts[0].split("=");
String name = parts2[0];
String type = parts2[1];
String info = parts[1];

answered Aug 23, 2012 at 8:32

Peter Lawrey

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Comments

zb226 · Accepted Answer · 2012-08-23 08:37:37Z

4

Using only one .split():

String s = "name=type,info1;101;localhost;-1;false;false";
String[] words = s.split("=|,");
String name = words[0];
String type = words[1];
String info = words[2];
System.out.println("Name: " + name + "\nType: " + type + "\nInfo: " + info);

Output:

Name: name
Type: type
Info: info1;101;localhost;-1;false;false

answered Aug 23, 2012 at 8:37

zb226

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Comments

AlexR · Accepted Answer · 2012-08-23 08:35:14Z

4

I think that you should use patterns here.

Pattern p = Pattern.compile("(\\w+)=(\\w+),(.*)");
Matcher m = p.matcher(str);
if (m.find()) {
    String name = m.group(1);
    String type = m.group(2);
    String info = m.group(3);
}

answered Aug 23, 2012 at 8:35

AlexR

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Comments

EthanB · Accepted Answer · 2012-08-23 08:32:43Z

Split:

@Test
public void testParseUsingSplit() {
    String line = "name=type,info1;101;localhost;-1;false;false";

    String name;
    String type;
    String info;

    String[] split1 = line.split(",", 2);
    info = split1[1];
    String[] split2 = split1[0].split("=");
    name = split2[0];
    type = split2[1];

    Assert.assertEquals("name", name);
    Assert.assertEquals("type", type);
    Assert.assertEquals("info1;101;localhost;-1;false;false", info);
}

Regex:

@Test
public void testParseUsingRegex() {
    String line = "name=type,info1;101;localhost;-1;false;false";

    Pattern pattern = Pattern.compile("([^=]+)=([^,]+),(.*)");
    Matcher m = pattern.matcher(line);
    Assert.assertTrue(m.matches());

    String name = m.group(1);
    String type = m.group(2);
    String info = m.group(3);

    Assert.assertEquals("name", name);
    Assert.assertEquals("type", type);
    Assert.assertEquals("info1;101;localhost;-1;false;false", info);
}

sakthisundar · Accepted Answer · 2012-08-23 08:39:36Z

1

public  void splitString(String connectionString) {
        String[] splitted = connectionString.split(",");
        String[] nameAndType = splitted[0].split("=");
        String name = nameAndType[0];
        String type = nameAndType[1];
        String info = splitted[1].substring(splitted[1].indexOf("info")+4);
        System.out.println(" name "+name);
        System.out.println(" type "+type);
        System.out.println(" info "+info);
    }

Try this out. Is this what you are trying to do ?

answered Aug 23, 2012 at 8:39

sakthisundar

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2 Comments

Eugene Over a year ago

you assume that info is actually always a String "info", not good.

sakthisundar Over a year ago

yeah. Some interesting thought. :-) there is no need for that subs tring operation here. I admit.

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