Char Matcher Retain From 

Google Guava is a java library with lot of utilities and reusable components. This requires the library guava-10.0.jar to be in classpath. The following example shows using CharMatcher.retainFrom() API. It returns a string containing all matching characters from the given char sequence.

File Name  :   com/bethecoder/tutorials/guava/base_tests/CharMatcherRetainTest.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.guava.base_tests; import com.google.common.base.CharMatcher; public class CharMatcherRetainTest {   /**    * @param args    */   public static void main(String[] args) {     String bigNumStr = "426,236,358";     long myNum = Long.parseLong(CharMatcher.DIGIT.retainFrom(bigNumStr));          System.out.println(myNum);     System.out.println(CharMatcher.DIGIT.retainFrom("123,456,789"));   } }

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