RemoveCharsFromString.java

package com.levelup.java.string;

import static org.junit.Assert.assertEquals;

import org.apache.commons.lang3.StringUtils;
import org.junit.Test;

import com.google.common.base.CharMatcher;

/**
 * This java example will demonstrate removing chars
 * from string.
 * 
 * @author Justin Musgrove
 * @see <a href='http://www.leveluplunch.com/java/examples/remove-character-from-string/'>Remove character from string</a>
 * 
 */
public class RemoveCharsFromString {

	@Test
	public void remove_chars_from_java () {
		
		String parsedTelePhoneNumber = "920-867-5309".replace("-", "");
		assertEquals("9208675309", parsedTelePhoneNumber);
	}

	@Test
	public void remove_all_special_chars_from_java () {

		String parsedTelePhoneNumber = "+920-867-5309".replaceAll("[\\D]", "");
		assertEquals("9208675309", parsedTelePhoneNumber);
	}
	
	@Test
	public void remove_char_from_string_guava() {

		String telephoneNumber = CharMatcher.inRange('0', '9').retainFrom(
				"920-867-5309");
		assertEquals("9208675309", telephoneNumber);

		// worried about performance?
		CharMatcher digits = CharMatcher.inRange('0', '9').precomputed();
		String teleNumber = digits.retainFrom("920-867-5309");
		assertEquals("9208675309", teleNumber);
	}
	
	@Test
	public void remove_char_from_string_apache_commons() {

		String parsedTelephoneNumber = StringUtils.remove("920-867-5309", '-');

		assertEquals("9208675309", parsedTelephoneNumber);
	}
	
	@Test
	public void remove_char_from_string_spring() {

		String parsedTelephoneNumber = org.springframework.util.StringUtils
				.replace("920-867-5309", "-", "");

		assertEquals("9208675309", parsedTelephoneNumber);
	}
	
}