regular expression in javascript. Need to write the same in java

I have a following code in javascript :
var snippetFilename = function (title, mode) {
    var filename = title;
    filename = filename.replace(/\s/g, "_").replace(/\W/g, "");
    filename += "." + meta.extensions[mode];
    return filename;

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I dont clearly understand this line : filename.replace(/\s/g, "_").replace(/\W/g, "");
I need to convert this code into java.
Please help
Rohit BajajAsked:
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In english:

find all single whitespace characters and replace with underscore.
The bit between the two forward slashes is the pattern i.e. \s is an escape for a space character.
/g is doing the replace globally.

Then using the result, remove all non word characters e.g anything that is NOT A-Z or a-z or 0-9 or underscore.

In Java:
String data = "ABCD  GD asd   sds f32(*£ ";

String result = test.replaceAll("\\s", "_").replaceAll("\\W", "");

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