Using a Pattern to compile a regex for use instead of String.split()

MultilineStringSplitUsingRegex.java

import java.util.regex.Pattern;

public class MultilineStringSplitUsingRegex {
	private static final Pattern pattern = Pattern.compile("\\r?\\n");

	public static void main(String[] args) {
		MultilineStringSplitUsingRegex m = new MultilineStringSplitUsingRegex();
		String[] s1 = m.splitWithPattern();
		String[] s2 = m.splitWithStringSplit();
	}

	/**
	 * Method makes use of a precompiled pattern that is not re-compiled repeatedly. 
	 * This is better than using String.split()
	 * 
	 */
	private String[] splitWithPattern() {
		String str = "asdf\nqwer";
		return pattern.split(str);
	}

	/**
	 * Example of expensive method. Regex pattern is created needlessly by String.split() 
	 * (and also String.matches() method) every time this method is called. 
	 * The java.util.regex.Pattern.compile() methods have a significant 
	 * performance cost, and therefore should be used sensibly.
	 * 
	 * @return
	 */
	private String[] splitWithStringSplit() {
		String str = "asdf\nqwer";
		return str.split("\\r?\\n");
	}
}