Javascript - extract specific numbers from string

Question

I'm trying to extract specific numbers from a string but I'm not sure how to execute it.

The string is of the form:

center=43.571464,7.129565&zoom=12&size=480x225&markers=color:red%7Clabel:1%7C43.580293713725936,7.115145444335894&markers=color:red%7Clabel:2%7C43.56512073056565,7.121668576660113&sensor=false

The array I want is the marker coordinates near the end, specifically:

[43.580293713725936,7.115145444335894,43.56512073056565,7.121668576660113]

I thought I could pick these number out using their precision (15) but I don't know if that's best. I'm a hack when it comes to using regular expressions. Right now the best I've got is:

str.match(/[-+]?[0-9]*\.?[0-9]+/g)

But that just gives me all of the numbers.

Help much appreciated!

Shiplu Mokaddim · Accepted Answer · 2012-04-07 16:43:38Z

1

If your string is in str use this regex.

var coordinates = decodeURIComponent(str).match(/([\d.]{10,})/g);

http://jsfiddle.net/CHfcT/

answered Apr 7, 2012 at 16:43

Shiplu Mokaddim

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Robbie · Accepted Answer · 2012-04-08 12:28:22Z

1

You could try using the following regex

/\d+\.\d{7,}/g

This assumes that:

The marker coordinates always have 7 or more numbers after the dot
No other part of the string contains a similar pattern with more than 7 numbers after a dot

Example (JSFiddle):

str.match(/\d+\.\d{7,}/g);

The reason I picked 7 was because the other numbers in the sample had 6, so that excludes them. If you know that the coordinates always have a fixed number of decimal places, then you could just use that specific number without the , like this:

/\s+\.\d{10}/g

edited Apr 8, 2012 at 12:28

answered Apr 7, 2012 at 16:44

Robbie

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