Regex: extract float data from String and group it

Question

i have a string like this one:

288.999,224.004 283.665,258.338 313.332,293.005 312.332,336.671 270.999,389.338 371.998,412.338

i try to parse the data to float values, but i want to sort it! The value before comma should by my x value and the value after comma should be the y value.

Pattern p = Pattern.compile("[0-9]+.[0-9]*");
Matcher m = p.matcher(pointString);
while(m.find())
{
   System.out.print("x:"+m.group(0)); //x- Values
  // System.out.print("y:"+m.group(1)); //y- Values
}

This code just creates a single group...How should i change my String pattern to get a second group with the y-Values...

favored result:

x:288.999
y:224.004 
x:283.665
y:258.338 
....

doesn´t work m.group(0) and m.group(1) have the same values! — JavaNullPointer
– JavaNullPointer, Commented Jun 26, 2013 at 9:38

Jiri Kremser · Accepted Answer · 2013-06-26 09:35:07Z

8

Keep it simple, split is enough:

String input = "288.999,224.004 283.665,258.338 313.332,293.005 312.332,336.671 270.999,389.338 371.998,412.338";

String[] points = input.split(" ");
for (String point : points) {
  String[] coordinates = point.split(",");
  System.out.println("x:" + coordinates[0]);
  System.out.println("y:" + coordinates[1]);
}

answered Jun 26, 2013 at 9:35

Jiri Kremser

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3 Comments

JavaNullPointer Over a year ago

got a OutOfBoundsException: length=1 index=1 for System.out.println("y:" + coordinates[1]);

Viktor Mellgren Over a year ago

check the contents of coordinates[0], seems like split(","); fails

Jiri Kremser Over a year ago

if there are also \n as a separators, you can use the input.split("\\s");

morgano · Accepted Answer · 2013-06-26 09:59:05Z

2

The pattern you are looking for:

((?:\\d*\\.\\d+)|(?:\\d+\\.\\d*)) *, *((?:\\d*\\.\\d+)|(?:\\d+\\.\\d*))

also, group(0) would bring the whole match, you're rather looking for group(1) and group(2)

edited Jun 26, 2013 at 9:59

answered Jun 26, 2013 at 9:46

morgano

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2 Comments

JavaNullPointer Over a year ago

got a " Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ )"

morgano Over a year ago

edited, you need to use double "\" when using strings in java

Ruchira Gayan Ranaweera · Accepted Answer · 2013-06-26 09:55:05Z

0

This will work

 String str = "288.999,224.004 283.665,258.338 313.332,293.005 312.332,336.671 270.999,389.338 371.998,412.338";
    String[] points=str.split(" ");
    String[] point=new String[2];
    for(int i=0;i<points.length;i++){
        point=points[i].split(",");
        System.out.println("X-val: "+point[0]);
        System.out.println("Y-val: "+point[1]);
    }

answered Jun 26, 2013 at 9:55

Ruchira Gayan Ranaweera

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