本文主要测试字符类的用法,测试的结果作为注释放在测试方法的后面。
package regularexpression; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.junit.Test; /** * 测试字符类; * @author yuncong * */ public class TestRegularExpression { /** * 0. 单个字符匹配其本身 */ @Test public void test0() { String regex = "d"; String input = "1B2s-[23d@3^"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * d */ /** * 1. [C1C2...],表示任何C1,C2,...中的某个字符, * 其中Ci可以是是多个字符(如aB)、字符范围(如A-Z、 * a-z、0-9)或字符类(如[A-Z]、\d) */ @Test public void test1() { // 多个字符 String regex = "[abcd]"; String input = "1B2s23d3"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * d */ @Test public void test2() { // 字符范围 String regex = "[A-za-z]"; String input = "1B2s23d3"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * B * s * d */ @Test public void test3() { // 字符类 String regex = "[[A-za-z][0-9]]"; String input = "1B2s23d3"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * 1 * B * 2 * s * 2 * 3 * d * 3 */ /** * 2. [^...],表示字符类的补集中的某个字符 */ @Test public void test4() { String regex = "[^A-za-z]"; String input = "1B2s23d3"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * 1 * 2 * 2 * 3 * 3 */ /** * 如果字符类包含^,^可以放在除开始位置之外的任何位置, * 也就是说,只有当^放在开始位置时,才具有取补的功能 */ @Test public void test5() { // 第二个^就是一个普通的匹配字符 String regex = "[^0-9^]"; String input = "1B2s2^3d@^3"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * B * s * d * @ */ /** * 如果字符类包含-,-必须是第一项或者最后一项 */ @Test public void test6() { String regex = "[-0-9]"; String input = "1B2s-23d@3^"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * 2 * - * 2 * 3 * 3 */ /** * 如果字符类中包含[,必须放在第一项并且转义 */ @Test public void test7() { String regex = "[\\[0-9]"; String input = "1B2s-[23d@3^"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * 1 * 2 * [ * 2 * 3 * 3 */ /** * 3. [...&&...],两个字符类的交集 */ @Test public void test8() { String regex = "[abcd&&a-z]"; String input = "1B2s-[23d@3^"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * d */ /** * 4. \w, 一个词语字符类(也就是一个单词中可能存在的字符), * 等价于[A-Za-z0-9_] */ @Test public void test9() { String regex = "\\w"; String input = "1B2s-[23d李@3^"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * 1 * B * 2 * s * 2 * 3 * d * 3 */ /** * 5. \p{name}, 表示一个命名字符类 */ @Test public void test10() { String regex = "\\p{Upper}"; String input = "1B2s-[23d李@3^"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(input); while (matcher.find()) { String output = matcher.group(); System.out.println(output); } } /** * 输出: * B */ }
原文地址:http://blog.csdn.net/l294265421/article/details/46508165