Java – replace substrings of matching regular expressions

I get some HTML and do some string manipulation and use similar strings

string sample = "\n    \n   2 \n      \n  \ndl. \n \n    \n flour\n\n     \n 4   \n    \n cups of    \n\nsugar\n"

I want to find all component lines and remove spaces and line breaks

2 dl. Flour and 4 cups sugar

So far, my method is as follows

Pattern p = Pattern.compile("[\\d]+[\\s\\w\\.]+");
Matcher m = p.matcher(Result);

while(m.find()) {
  // This is where i need help to remove those pesky whitespaces
}

Solution

The following code should suit you:

String sample = "\n    \n   2 \n      \n  \ndl. \n \n    \n flour\n\n     \n 4   \n    \n cups of    \n\nsugar\n";
Pattern p = Pattern.compile("(\\s+)");
Matcher m = p.matcher(sample);
sb = new StringBuffer();
while(m.find())
    m.appendReplacement(sb," ");
m.appendTail(sb);
System.out.println("Final: [" + sb.toString().trim() + ']');

OUTPUT

Final: [2 dl. flour 4 cups of sugar]